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A new clerodane diterpene with antifeedant activity from Teucrium tomentosum
S Soundarya Devi1, R Malathi, S S Rajan
1Department of Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai 600 025, India.
Abstract:
A new diterpene, viz. 3beta-acetoxy-4alpha,18:15,16-diepoxy-6beta,12-dihydroxyneocleroda-13(16),14-dien-19,20-olide, C(22)H(28)O(8), exhibiting antifeedant activity against Spodoptera litura was isolated from the aerial parts of Teucrium tomentosum and its structure is reported. One of the two fused rings has a distorted-chair conformation and the other has a chair conformation. The molecules in the crystal are stabilized via O--H...O and C--H...O hydrogen bonds.