Abstract
Abstract Papyracillic acid ( 1 ), an antibiotic isolated from the ascomycete Lachnum papyraceum , owes its bioactivities to its reactivity towards nucleophiles. When reacted with cysteine and cysteine methyl ester, it exclusively added the thiol groups to the exomethylene double bond. Both papyracillic acid ( 1 ) and its analogue penicillic acid ( 2 ) react with pyridine to indolizine derivatives during acetylation conditions. © 1997 Elsevier Science Ltd.
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