title: A new clerodane diterpene with antifeedant activity from Teucrium tomentosum.
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.
authors.affiliation: Department of Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai 600 025, India.
authors.forename: S
authors.initials: S
authors.lastname: Soundarya Devi
authors.forename: R
authors.initials: R
authors.lastname: Malathi
authors.forename: S S
authors.initials: SS
authors.lastname: Rajan
authors.forename: S
authors.initials: S
authors.lastname: Aravind
authors.forename: G N
authors.initials: GN
authors.lastname: Krishnakumari
authors.forename: K
authors.initials: K
authors.lastname: Ravikumar
mesh_terms: D000818:Animals; D018360:Crystallography, X-Ray; D004224:Diterpenes / Q000737:chemistry* / Q000494:pharmacology; D045785:Diterpenes, Clerodane; D005247:Feeding Behavior / Q000187:drug effects; D006860:Hydrogen Bonding; D007306:Insecticides / Q000737:chemistry; D015394:Molecular Structure; D018411:Spodoptera; D031367:Teucrium / Q000737:chemistry*
chemical_list: D004224:Diterpenes; D045785:Diterpenes, Clerodane; D007306:Insecticides