Four new compounds from Paeonia albiflora.

Studies on the chemical constituents of the roots of Paeonia albiflora Pall. led to the isolation of four new compounds named (3R,4S)-3-methyl-3,4-dihydro-5,6,7-trihydroxy-4-(3'-methoxy-4'-hydroxyphenyl)-1H-[2]-benzopyran-1-one (1), 5-hydroxy-6-methyl-1H-indole-3-carbaldehyde (2), trans-5-hydroxy-2-methoxy-6-methyl-2,3-dihydrobenzofuran-3-yl methyl benzoate (3) and cis-5-hydroxy-2-methoxy-6-methyl-2,3-dihydrobenzofuran-3-yl methyl benzoate (4), and two known ones, (7S,8S)-3-methoxy-3',7-epoxy-8,4'-oxyneligna-4,9,9'-triol (5) and (7S,8R)-dihydrodehydrodiconifery alcohol (6). Their structures were determined mainly by spectroscopic techniques including 2D-NMR (HSQC, HMBC, NOESY), MS, and CD experiments.