permethylation, hydrolysis and per-j?-bromobenzoylation. Formation of the 2,6-dideoxy-3-0-acetyl-D-/yx0-hexopyranose in earlier studies wasattributed to migration of the acetyl group under the reaction conditions.6) The structure of the aglycon of chromomycins,chromomy-

Detailed studies on the 13C and 1H NMRspectra of chromomycins A2 and A3, olivomycins A and B, and their derivatives clarified the assignment of manysignals which had been unassigned or erroneously reported in the literatures. The revised assignments for chromomycin A3 and olivomycin A include the assignment of a key 13C signal used to discuss the saccharide linkage in question. Structure analyses based on the revised assignments support the a,l-»3-bond between componentsof the disaccharide moiety in the molecules. Some general information useful for structure analysis of saccharides is also reported.