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The S-methyl groups of methionin, labelled with lac, are incorporated in rifamycins by Streptomyces medaterranei only in the methoxy group.Thc consequences of these findings for the biogenesis of other ansamycins, e.g. streptovaricins, are discussed. The similarities in the constitution and configuration of ansamycins and macrolidcs (cf. [9]

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Die Methanolyse von Sibiromycin in siedender 9%iger methanolischer Salzsäure ergibt ein Gemisch anomerer Methylglykoside von Sibirosamin, von denen das eine die Struktur (I) besitzt.