Literature DB >> 22259556

The desoxazoline asidiacyclamide analogue cyclo(Gly-Thr-D-Val-Thz-Ile-Thr-D-Val-Thz) acetonitrile monosolvate.

Akiko Asano1, Mitsunobu Doi.   

Abstract

THE TITLE PEPTIDE [SYSTEMATIC NAME: 4-(butan-2-yl)-7,20-bis-(1-hy-droxy-eth-yl)-10,23-bis-(propan-2-yl)-12,25-dithia-3,6,9,16,19,22,27,28-octa-aza-tricyclo-[22.2.1.1(11,14)]octa-cosa-1(26),11(28),13,24(27)-tetra-ene-2,5,8,15,18,21-hexone acetonitrile monosolvate], C(32)H(48)N(8)O(8)S(2)·CH(3)CN, an analogue of ascidiacyclamide (ASC) [cyclo(-Ile-Oxz-D-Val-Thz-)(2)], lies about a twofold rotation axis, so that the glycine (Gly) and isoleucine (Ile) residues are each disordered over two sites with equal occupancies. The acetonitrile mol-ecule is also located on a twofold axis passing through the C and N atoms. In the peptide, the thia-zole rings are faced to each other with a dihedral angle of 9.63 (15)° and intra-molecular N-H⋯O and O-H⋯O hydrogen bonds are observed. A bifurcated N-H⋯(O,O) hydrogen bond links the peptide mol-ecules into a layer parallel to the ab plane.

Entities:  

Year:  2011        PMID: 22259556      PMCID: PMC3254412          DOI: 10.1107/S1600536811051543

Source DB:  PubMed          Journal:  Acta Crystallogr Sect E Struct Rep Online        ISSN: 1600-5368


Related literature

For general background to ascidiacyclamide, see: Hamamoto et al. (1983 ▶); Shioiri et al. (1987 ▶); Ishida et al. (1988 ▶); Degnan et al. (1989 ▶); Doi et al. (1999 ▶); Haberhauer & Rominger (2003 ▶). For related structures, see: Schmitz et al. (1989 ▶); n class="Chemical">Asano, Doi et al. (2001 ▶); Asano, Taniguchi et al. (2001 ▶); Asano et al. (2002 ▶, 2003 ▶, 2005 ▶).

Experimental

Crystal data

C32H48N8O8S2·C2H3N M = 777.96 Orthorhombic, a = 18.2019 (9) Å b = 10.4667 (5) Å c = 11.0695 (6) Å V = 2108.89 (18) Å3 Z = 2 Mo Kα radiation μ = 0.18 mm−1 T = 200 K 0.40 × 0.40 × 0.10 mm

Data collection

Bruker SMART APEX CCD area-detector diffractometer Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ▶) T min = 0.909, T max = 0.982 24275 measured reflections 4669 independent reflections 4359 reflections with I > 2σ(I) R int = 0.026

Refinement

R[F 2 > 2σ(F 2)] = 0.075 wR(F 2) = 0.213 S = 1.09 4669 reflections 269 parameters H-atom parameters constrained Δρmax = 0.92 e Å−3 Δρmin = −1.42 e Å−3 Absolute structure: Flack (1983 ▶), 2016 Friedel pairs Flack parameter: 0.11 (13) Data collection: SMART (Bruker, 1998 ▶); cell refinement: SAINT-Plus (Bruker, 1998 ▶); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: PLATON (Spek, 2009 ▶); software used to prepare material for publication: SHELXL97. Crystal structure: contains datablock(s) global, I. DOI: 10.1107/S1600536811051543/is5015sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536811051543/is5015Isup2.hkl Supplementary material file. DOI: 10.1107/S1600536811051543/is5015Isup3.mol Additional supplementary materials: crystallographic information; 3D view; checkCIF report
C32H48N8O8S2·C2H3NF(000) = 828
Mr = 777.96Dx = 1.225 Mg m3
Orthorhombic, P21212Mo Kα radiation, λ = 0.71073 Å
Hall symbol: P 2 2abCell parameters from 8940 reflections
a = 18.2019 (9) Åθ = 2.2–25.5°
b = 10.4667 (5) ŵ = 0.18 mm1
c = 11.0695 (6) ÅT = 200 K
V = 2108.89 (18) Å3Plate, colourless
Z = 20.40 × 0.40 × 0.10 mm
Bruker SMART APEX CCD area-detector diffractometer4669 independent reflections
Radiation source: MacScience, M18XCE rotating anode4359 reflections with I > 2σ(I)
graphiteRint = 0.026
Detector resolution: 8.366 pixels mm-1θmax = 27.1°, θmin = 1.8°
ω–scanh = −23→23
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)k = −13→13
Tmin = 0.909, Tmax = 0.982l = −14→14
24275 measured reflections
Refinement on F2H-atom parameters constrained
Least-squares matrix: fullw = 1/[σ2(Fo2) + (0.1468P)2 + 0.6849P] where P = (Fo2 + 2Fc2)/3
R[F2 > 2σ(F2)] = 0.075(Δ/σ)max = 0.017
wR(F2) = 0.213Δρmax = 0.92 e Å3
S = 1.09Δρmin = −1.42 e Å3
4669 reflectionsAbsolute structure: Flack (1983), 2016 Friedel pairs
269 parametersFlack parameter: 0.11 (13)
0 restraints
Geometry. Thz-Thz plane angle = 9.54 °, S(Thz)···S(Thz) = 4.303 A (mercury)
xyzUiso*/UeqOcc. (<1)
C10.50000.50000.2003 (14)0.108 (3)
C20.50000.50000.3182 (14)0.130 (4)
H2A0.44970.51160.34770.195*0.50
H2B0.53090.57000.34770.195*0.50
H2C0.51940.41840.34770.195*0.50
N10.50000.50000.0925 (9)0.107 (3)
N110.51634 (15)0.8447 (3)0.0697 (3)0.0418 (6)
H110.47320.87690.05050.050*
C110.572 (3)0.812 (4)−0.024 (4)0.045 (6)0.50
H11A0.54800.8033−0.10350.054*0.50
H11B0.59560.7293−0.00350.054*0.50
C11'0.564 (2)0.827 (5)−0.038 (4)0.044 (6)0.50
H11C0.58360.7382−0.03450.053*0.50
C12'0.5197 (4)0.8380 (9)−0.1579 (7)0.0539 (18)0.50
H120.49500.9233−0.15680.065*0.50
C13'0.5723 (5)0.8385 (12)−0.2662 (7)0.070 (2)0.50
H13A0.60900.9060−0.25540.106*0.50
H13B0.54440.8543−0.34040.106*0.50
H13C0.59700.7555−0.27180.106*0.50
C14'0.4574 (6)0.7354 (11)−0.1663 (12)0.081 (3)0.50
H14A0.44810.6952−0.08680.097*0.50
H14B0.41110.7733−0.19660.097*0.50
C15'0.4887 (8)0.6390 (16)−0.2562 (14)0.116 (5)0.50
H15A0.45270.5710−0.27010.174*0.50
H15B0.53390.6020−0.22340.174*0.50
H15C0.49950.6822−0.33270.174*0.50
C160.62923 (19)0.9158 (3)−0.0285 (3)0.0467 (8)
O160.61582 (14)1.0319 (3)−0.0393 (2)0.0525 (6)
N210.69723 (16)0.8697 (3)−0.0161 (3)0.0505 (7)
H210.70220.7861−0.01760.061*
C210.76449 (19)0.9454 (4)0.0001 (3)0.0482 (8)
H21A0.80560.88220.00490.058*
C220.7838 (2)1.0347 (4)−0.1057 (3)0.0564 (9)
H22A0.83561.0632−0.09290.068*
O220.73999 (17)1.1466 (3)−0.1100 (3)0.0661 (8)
H220.69641.1278−0.09210.099*
C230.7822 (3)0.9632 (6)−0.2260 (4)0.0814 (15)
H23A0.79481.0222−0.29160.122*
H23B0.73290.9285−0.23970.122*
H23C0.81790.8932−0.22400.122*
C240.76604 (19)1.0189 (4)0.1201 (3)0.0459 (7)
O240.80873 (17)1.1097 (3)0.1328 (2)0.0615 (7)
N310.27760 (14)1.0230 (3)0.2096 (2)0.0403 (6)
H310.30121.09580.20060.048*
C310.28693 (17)0.9514 (3)0.3208 (3)0.0390 (6)
H31A0.25780.87100.31140.047*
C320.2561 (2)1.0205 (4)0.4338 (3)0.0504 (8)
H320.27070.97000.50660.061*
C330.2876 (3)1.1554 (5)0.4473 (4)0.0688 (12)
H33A0.34131.15090.45030.103*
H33B0.26911.19390.52210.103*
H33C0.27241.20760.37820.103*
C340.1722 (3)1.0227 (7)0.4279 (5)0.0808 (16)
H34A0.15370.93540.41810.121*
H34B0.15651.07490.35910.121*
H34C0.15261.05930.50280.121*
C430.36703 (17)0.9114 (3)0.3314 (3)0.0377 (6)
N410.40907 (14)0.8932 (2)0.2387 (2)0.0380 (5)
C410.47758 (17)0.8488 (3)0.2747 (3)0.0396 (6)
C420.4862 (2)0.8312 (3)0.3948 (3)0.0457 (7)
H420.52950.80020.43250.055*
S420.40690 (5)0.87335 (9)0.46931 (7)0.0496 (3)
C440.53543 (17)0.8225 (3)0.1831 (3)0.0406 (7)
O440.59620 (14)0.7815 (2)0.2133 (2)0.0506 (6)
U11U22U33U12U13U23
C10.114 (7)0.077 (6)0.133 (10)−0.045 (5)0.0000.000
C20.148 (11)0.073 (6)0.168 (13)0.009 (6)0.0000.000
N10.116 (6)0.098 (5)0.106 (6)−0.056 (5)0.0000.000
N110.0380 (13)0.0362 (13)0.0512 (14)−0.0033 (10)0.0115 (11)−0.0055 (11)
C110.052 (15)0.038 (10)0.044 (7)−0.010 (8)0.007 (7)−0.014 (7)
C11'0.033 (5)0.044 (11)0.056 (13)−0.003 (6)0.010 (7)−0.010 (7)
C12'0.038 (3)0.066 (5)0.058 (4)0.000 (3)0.001 (3)−0.015 (4)
C13'0.061 (4)0.108 (7)0.042 (4)0.002 (5)0.002 (3)−0.020 (4)
C14'0.072 (6)0.079 (6)0.092 (8)−0.014 (5)0.003 (5)−0.019 (6)
C15'0.098 (9)0.125 (11)0.125 (10)−0.022 (9)−0.025 (8)−0.055 (10)
C160.0473 (17)0.0529 (18)0.0400 (15)−0.0156 (15)0.0093 (14)−0.0128 (14)
O160.0527 (13)0.0491 (13)0.0558 (14)−0.0133 (11)0.0054 (11)0.0011 (11)
N210.0476 (15)0.0455 (15)0.0582 (16)−0.0079 (12)0.0158 (13)−0.0106 (14)
C210.0416 (16)0.0538 (18)0.0493 (19)−0.0067 (14)0.0093 (13)−0.0060 (15)
C220.0501 (18)0.074 (2)0.0449 (18)−0.0171 (19)0.0121 (15)−0.0031 (17)
O220.0568 (15)0.0703 (18)0.0714 (18)−0.0174 (14)0.0051 (13)0.0133 (15)
C230.084 (3)0.112 (4)0.048 (2)−0.028 (3)0.016 (2)−0.011 (3)
C240.0427 (16)0.0491 (17)0.0461 (17)−0.0031 (14)0.0028 (13)0.0028 (14)
O240.0681 (16)0.0656 (17)0.0508 (13)−0.0296 (14)0.0026 (13)−0.0035 (13)
N310.0395 (12)0.0372 (12)0.0444 (13)−0.0020 (11)−0.0003 (11)−0.0003 (10)
C310.0369 (14)0.0423 (15)0.0378 (14)−0.0009 (12)0.0027 (11)−0.0025 (12)
C320.0476 (17)0.061 (2)0.0428 (16)0.0097 (16)0.0065 (14)−0.0050 (15)
C330.081 (3)0.063 (2)0.062 (2)0.006 (2)0.014 (2)−0.026 (2)
C340.053 (2)0.118 (4)0.071 (3)0.021 (3)0.009 (2)−0.022 (3)
C430.0417 (15)0.0330 (13)0.0383 (14)0.0008 (11)0.0043 (12)0.0015 (11)
N410.0410 (12)0.0297 (10)0.0432 (12)0.0017 (10)0.0068 (11)0.0010 (10)
C410.0384 (14)0.0285 (12)0.0518 (17)0.0003 (11)0.0065 (13)0.0025 (12)
C420.0450 (17)0.0422 (16)0.0499 (18)0.0029 (14)0.0035 (14)0.0072 (14)
S420.0482 (4)0.0615 (5)0.0391 (4)0.0057 (4)0.0043 (3)0.0082 (4)
C440.0408 (15)0.0242 (11)0.0568 (18)−0.0015 (11)0.0103 (14)−0.0020 (12)
O440.0434 (12)0.0416 (11)0.0669 (16)0.0063 (10)0.0086 (12)0.0024 (11)
C1—N11.193 (15)C21—H21A1.0000
C1—C21.305 (19)C22—O221.417 (6)
C2—H2A0.9800C22—C231.528 (6)
C2—H2B0.9800C22—H22A1.0000
C2—H2C0.9800O22—H220.84
N11—C441.324 (5)C23—H23A0.9800
N11—C11'1.49 (4)C23—H23B0.9800
N11—C111.49 (5)C23—H23C0.9800
N11—H110.8800C24—O241.236 (5)
C11—C161.51 (5)C24—N31i1.344 (4)
C11—H11A0.9900N31—C24i1.344 (4)
C11—H11B0.9900N31—C311.451 (4)
C11'—C161.51 (5)N31—H310.8800
C11'—C12'1.55 (4)C31—C431.521 (4)
C11'—H11C1.0000C31—C321.550 (4)
C12'—C13'1.534 (11)C31—H31A1.0000
C12'—C14'1.565 (13)C32—C341.529 (6)
C12'—H121.0000C32—C331.531 (6)
C13'—H13A0.9800C32—H321.0000
C13'—H13B0.9800C33—H33A0.9800
C13'—H13C0.9800C33—H33B0.9800
C14'—C15'1.527 (18)C33—H33C0.9800
C14'—H14A0.9900C34—H34A0.9800
C14'—H14B0.9900C34—H34B0.9800
C15'—H15A0.9800C34—H34C0.9800
C15'—H15B0.9800C43—N411.294 (4)
C15'—H15C0.9800C43—S421.736 (3)
C16—O161.245 (5)N41—C411.389 (4)
C16—N211.336 (5)C41—C421.351 (5)
N21—C211.469 (4)C41—C441.487 (4)
N21—H210.8800C42—S421.719 (4)
C21—C241.535 (5)C42—H420.9500
C21—C221.538 (5)C44—O441.233 (4)
N1—C1—C2180.000 (3)C24—C21—H21A105.8
C1—C2—H2A109.5C22—C21—H21A105.8
C1—C2—H2B109.5O22—C22—C23111.4 (4)
H2A—C2—H2B109.5O22—C22—C21113.5 (3)
C1—C2—H2C109.5C23—C22—C21111.2 (4)
H2A—C2—H2C109.5O22—C22—H22A106.7
H2B—C2—H2C109.5C23—C22—H22A106.7
C44—N11—C11'126.0 (16)C21—C22—H22A106.7
C44—N11—C11116.1 (17)C22—O22—H22109
C44—N11—H11122.0C22—C23—H23A109.5
C11'—N11—H11111.9C22—C23—H23B109.5
C11—N11—H11122.0H23A—C23—H23B109.5
N11—C11—C16109 (3)C22—C23—H23C109.5
N11—C11—H11A109.8H23A—C23—H23C109.5
C16—C11—H11A109.8H23B—C23—H23C109.5
N11—C11—H11B109.8O24—C24—N31i122.6 (3)
C16—C11—H11B109.8O24—C24—C21119.7 (3)
H11A—C11—H11B108.3N31i—C24—C21117.6 (3)
N11—C11'—C16109 (3)C24i—N31—C31121.7 (3)
N11—C11'—C12'112 (3)C24i—N31—H31119.1
C16—C11'—C12'115 (3)C31—N31—H31119.1
N11—C11'—H11C106.7N31—C31—C43108.7 (2)
C16—C11'—H11C106.7N31—C31—C32113.6 (3)
C12'—C11'—H11C106.7C43—C31—C32114.4 (3)
C13'—C12'—C11'110.0 (18)N31—C31—H31A106.5
C13'—C12'—C14'114.1 (8)C43—C31—H31A106.5
C11'—C12'—C14'112.2 (19)C32—C31—H31A106.5
C13'—C12'—H12106.7C34—C32—C33111.3 (4)
C11'—C12'—H12106.7C34—C32—C31109.6 (3)
C14'—C12'—H12106.7C33—C32—C31111.9 (3)
C12'—C13'—H13A109.5C34—C32—H32108.0
C12'—C13'—H13B109.5C33—C32—H32108.0
H13A—C13'—H13B109.5C31—C32—H32108.0
C12'—C13'—H13C109.5C32—C33—H33A109.5
H13A—C13'—H13C109.5C32—C33—H33B109.5
H13B—C13'—H13C109.5H33A—C33—H33B109.5
C15'—C14'—C12'102.8 (9)C32—C33—H33C109.5
C15'—C14'—H14A111.2H33A—C33—H33C109.5
C12'—C14'—H14A111.2H33B—C33—H33C109.5
C15'—C14'—H14B111.2C32—C34—H34A109.5
C12'—C14'—H14B111.2C32—C34—H34B109.5
H14A—C14'—H14B109.1H34A—C34—H34B109.5
C14'—C15'—H15A109.5C32—C34—H34C109.5
C14'—C15'—H15B109.5H34A—C34—H34C109.5
H15A—C15'—H15B109.5H34B—C34—H34C109.5
C14'—C15'—H15C109.5N41—C43—C31123.1 (3)
H15A—C15'—H15C109.5N41—C43—S42114.6 (2)
H15B—C15'—H15C109.5C31—C43—S42122.1 (2)
O16—C16—N21123.0 (3)C43—N41—C41110.6 (3)
O16—C16—C11124.9 (17)C42—C41—N41115.6 (3)
N21—C16—C11112.1 (17)C42—C41—C44124.3 (3)
O16—C16—C11'115.9 (18)N41—C41—C44120.1 (3)
N21—C16—C11'121.0 (18)C41—C42—S42109.9 (3)
C16—N21—C21126.2 (3)C41—C42—H42125.1
C16—N21—H21116.9S42—C42—H42125.1
C21—N21—H21116.9C42—S42—C4389.31 (16)
N21—C21—C24113.0 (3)O44—C44—N11123.6 (3)
N21—C21—C22115.1 (3)O44—C44—C41121.0 (3)
C24—C21—C22110.5 (3)N11—C44—C41115.4 (3)
N21—C21—H21A105.8
C44—N11—C11—C16−79 (3)C22—C21—C24—O24−31.0 (5)
C11'—N11—C11—C1683 (20)N21—C21—C24—N31i21.2 (5)
C44—N11—C11'—C16−62 (3)C22—C21—C24—N31i151.9 (3)
C11—N11—C11'—C16−82 (19)C24i—N31—C31—C43117.0 (3)
C44—N11—C11'—C12'169.4 (14)C24i—N31—C31—C32−114.4 (4)
C11—N11—C11'—C12'149 (22)N31—C31—C32—C3470.0 (5)
N11—C11'—C12'—C13'172 (2)C43—C31—C32—C34−164.4 (4)
C16—C11'—C12'—C13'47 (3)N31—C31—C32—C33−54.0 (4)
N11—C11'—C12'—C14'−60 (3)C43—C31—C32—C3371.6 (4)
C16—C11'—C12'—C14'175 (2)N31—C31—C43—N41−27.9 (4)
C13'—C12'—C14'—C15'21.2 (13)C32—C31—C43—N41−156.0 (3)
C11'—C12'—C14'—C15'−105 (2)N31—C31—C43—S42157.8 (2)
N11—C11—C16—O16−52 (3)C32—C31—C43—S4229.6 (4)
N11—C11—C16—N21126 (2)C31—C43—N41—C41−175.8 (3)
N11—C11—C16—C11'−83 (19)S42—C43—N41—C41−1.0 (3)
N11—C11'—C16—O16−69 (3)C43—N41—C41—C421.3 (4)
C12'—C11'—C16—O1657 (3)C43—N41—C41—C44−179.3 (3)
N11—C11'—C16—N21114 (2)N41—C41—C42—S42−0.9 (4)
C12'—C11'—C16—N21−119 (2)C44—C41—C42—S42179.7 (2)
N11—C11'—C16—C1182 (18)C41—C42—S42—C430.3 (3)
C12'—C11'—C16—C11−151 (21)N41—C43—S42—C420.4 (3)
O16—C16—N21—C217.0 (6)C31—C43—S42—C42175.2 (3)
C11—C16—N21—C21−171.0 (18)C11'—N11—C44—O44−1(2)
C11'—C16—N21—C21−176.9 (19)C11—N11—C44—O443(2)
C16—N21—C21—C2465.8 (5)C11'—N11—C44—C41179 (2)
C16—N21—C21—C22−62.5 (5)C11—N11—C44—C41−177 (2)
N21—C21—C22—O2276.3 (4)C42—C41—C44—O440.3 (5)
C24—C21—C22—O22−53.2 (4)N41—C41—C44—O44−179.1 (3)
N21—C21—C22—C23−50.3 (5)C42—C41—C44—N11179.5 (3)
C24—C21—C22—C23−179.8 (4)N41—C41—C44—N110.1 (4)
N21—C21—C24—O24−161.7 (4)
D—H···AD—HH···AD···AD—H···A
O22—H22···O160.841.872.674 (4)160
N11—H11···O16i0.882.122.984 (3)166
N21—H21···O22ii0.882.292.953 (4)132
N21—H21···O24ii0.882.253.013 (4)145
N31—H31···O44i0.882.273.074 (3)152
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯AD—HH⋯ADAD—H⋯A
O22—H22⋯O160.841.872.674 (4)160
N11—H11⋯O16i0.882.122.984 (3)166
N21—H21⋯O22ii0.882.292.953 (4)132
N21—H21⋯O24ii0.882.253.013 (4)145
N31—H31⋯O44i0.882.273.074 (3)152

Symmetry codes: (i) ; (ii) .

  8 in total

1.  A short history of SHELX.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr A       Date:  2007-12-21       Impact factor: 2.290

2.  Cytotoxic activity of cyclic peptides of marine origin and their derivatives: importance of oxazoline functions.

Authors:  T Shioiri; Y Hamada; S Kato; M Shibata; Y Kondo; H Nakagawa; K Kohda
Journal:  Biochem Pharmacol       Date:  1987-12-01       Impact factor: 5.858

3.  Conformational change of ascidiacyclamide caused by asymmetric modification for an isoleucine residue: structural analyses of [Gly], [Leu], and [Phe]ascidiacyclamides by x-ray diffraction and NMR spectroscopy.

Authors:  M Doi; F Shinozaki; Y In; T Ishida; D Yamamoto; M Kamigauchi; M Sugiura; Y Hamada; K Kohda; T Shioiri
Journal:  Biopolymers       Date:  1999-05       Impact factor: 2.505

4.  A flat squared conformation of an ascidiacyclamide derivative caused by chiral modification of an oxazoline residue.

Authors:  Akiko Asano; Takeshi Yamada; Atsushi Numata; Yoshio Katsuya; Masahiro Sasaki; Taizo Taniguchi; Mitsunobu Doi
Journal:  Biochem Biophys Res Commun       Date:  2002-09-13       Impact factor: 3.575

5.  New cyclic peptides with cytotoxic activity from the ascidian Lissoclinum patella.

Authors:  B M Degnan; C J Hawkins; M F Lavin; E J McCaffrey; D L Parry; A L van den Brenk; D J Watters
Journal:  J Med Chem       Date:  1989-06       Impact factor: 7.446

6.  Effects of amino acids and chirality for molecular folding of desoxazoline-ascidiacyclamide derivatives: X-ray crystal structures of four cyclic octapeptides including unusual amino acids, cyclo(-Ile-aThr-D-Val-Thz-)(2), cyclo(-Ala-aThr-D-Val-Thz-Ile-aThr-D-Val-Thz-), cyclo(-Val-aThr-D-Val-Thz-Ile-aThr-D-Val-Thz-), and cyclo(-Ile-aThr-Val-Thz-Ile-aThr-D-Val-Thz-).

Authors:  A Asano; M Doi; K Kobayashi; M Arimoto; T Ishida; Y Katsuya; Y Mezaki; H Hasegawa; M Nakai; M Sasaki; T Taniguchi; A Terashima
Journal:  Biopolymers       Date:  2001-03       Impact factor: 2.505

7.  Cyclo(-Cha-Oxz-D-Val-Thz-Ile-Oxz-D-Val-Thz-) N,N-dimethylacetamide dihydrate: a square form of cyclohexylalanine-incorporated ascidiacyclamide having the strongest cytotoxicity.

Authors:  Akiko Asano; Takeshi Yamada; Atsushi Numata; Mitsunobu Doi
Journal:  Acta Crystallogr C       Date:  2003-08-09       Impact factor: 1.172

8.  Structure validation in chemical crystallography.

Authors:  Anthony L Spek
Journal:  Acta Crystallogr D Biol Crystallogr       Date:  2009-01-20
  8 in total

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