C NMR spectra of streptolydigin, tirandamycin, and related degradation products.

Absorptions of the 32 carbon atoms of streptolydigin, a 3-acyltetramic acid, have been assigned in its C NMR spectrum, as have the adsorptions of triandamycin and related degradation products. Methods employed in assigning the individual carbons include off-resonance decoupling, and comparison studies with appropriate model compounds.