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pentenoic acid (APPA). Rhizocticin A (5), B (6), C and D (7) were isolated as antifungal phosphono-origopeptides from the culture broth of Bacillus subtilis ATCC 6633. They contain APPA (8) in the L-configuration which was shown by gas chromatography of a derivative on a chiral stationary phaseX). At that time insufficient material was isolated for a determination of the [a]Dvalue. The plumbemycins A (1) and B (2), isolated as antagonists of L-threonine from Streptomyces plumbeus, were reported to have APPAin the D-configuration3). The absolute configuration was based on the CloughLutz-Jirgensons rule which indicated the D-configuration of amino acids4). In this paper an efficient digestion of rhizocticins to L-APPA, additional physico-chemical data of l-APPA (8) and the identity of the absolute

Digestion of Rhizocticins to (Z)-L-2-amino-5-phosphono-3-pentenoic acid:Revision of the Absolute Configuration of Plumbemycins A and B.