Abstract
Two new naturally-occurring analogues of the phytotoxin coronatine have been isolated from liquid cultures of Pseudomonas syringae pv. glycinea. These have been identified as N-coronafacoyl- L-isoleucine and N-coronafacoyl- L-alloisoleucine by mass spectrometry and by studies of the products of acid hydrolysis of the two compounds. The compounds were purified as a mixture of ca 2:1 composition, but the two parent components were not preparatively separated. The possible significance of the two compounds, to the biosynthesis of coronatine, is discussed.
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