title: A new conformer of 20-hydroxyecdysone from Sesuvium portulacastrum: an x-ray crystallographic study.
abstract: X-ray single crystal analysis of 20-hydroxyecdysone (20E, 2), an important insect moulting hormone, isolated from Sesuvium portulacastrum Linn. was found to exhibit a unique stereochemical configuration revealing it to be a different conformer (polymorph) possessing the aliphatic chain atoms in a trans configuration. Moreover, the analysis also revealed the presence of three molecules of water of crystallisation thereby restricting the freedom of the aliphatic side chain.
authors.affiliation: Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India. smrele@emory.edu
authors.forename: Shyam
authors.initials: S
authors.lastname: Rele
authors.forename: Asoke
authors.initials: A
authors.lastname: Banerji
authors.forename: Gajanan
authors.initials: G
authors.lastname: Chintalwar
authors.forename: Vinay
authors.initials: V
authors.lastname: Kumar
authors.forename: Vijay
authors.initials: V
authors.lastname: Yadava
mesh_terms: D035722:Aizoaceae; D018360:Crystallography, X-Ray; D004441:Ecdysterone / Q000737:chemistry*; D006801:Humans; D007536:Isomerism; D008517:Phytotherapy; D010936:Plant Extracts / Q000737:chemistry
chemical_list: D010936:Plant Extracts; D004441:Ecdysterone