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Respinomycins A1, A2, B, C and D were revealed to be novel anthracycline antibiotics with molecular formulae of C51H72N2O20, C43H58N2O15, C35H43NO14, C36H45NO14 and C51H70N2O22, respectively. Their structures were determined by means of 1H-1H COSY, 13C-1H COSY and HMBC spectra. The structure of the aglycone of respinomycins was unambiguously determined by LSPD experiments and NOESY. The common skeleton of respinomycins is a new type and is distinguished from that of the nogalamycin group.

Respinomycins A1, A2, B, C and D, a novel group of anthracycline antibiotics. II. Physico-chemical properties and structure elucidation.