1959 Volume 23 Issue 6 Pages 536-547
Esperin is an acidic antibiotic with a molecular formula of C39H67N5O11 and, on hydrolysis with acid, it afforded L-aspartic acid, L-glutamic acid, L-valine, L-leucine, D-leucine and 2-tridecenoic acid. By treatment with alkali, esperin was transformed to esperinic acid, C39H69N5O12, which was shown to be β-hydroxytridecanoyl-glutamyl-aspartyl-valyl-leucyl-leucine. From chemical and physical studies, esperin was proved to be the lactone of esperinic acid, represented by the formula III.
This article cannot obtain the latest cited-by information.