title: [1R-(1α,2α,4α,5β,6α,7α)]-4-Benzoyl-oxymethyl-5,6-dihy-droxy-3,8-dioxa-tricyclo-[5.1.0.0]octan-5-yl acetate (3-deacetyl-crotepoxide) from Kaempferia rotunda Val.
abstract: The title compound, C(16)H(16)O(7), isolated from Kaempferia rotunda rhizomes, features a six-membered cyclo-hexane ring that adopts a twisted-boat conformation owing to the presence of two adjacent epoxide attachments that lock in four of the six axial positions. The CH(3)CO(2)- and HO- substituents occupy equatorial positions. However, the bond angles at the ring carbon connected to the C(6)H(5)CO(2)CH(2)- substituent deviate signifcantly from the idealized tetra-hedral angles as the carbon atom is part of an epoxide ring. In the crystal, the molecules are linked into chains by O-H⋯O hydrogen bonds.
authors: Hasnah Mohd
authors: HM
authors: Sirat
authors: Yau Sui
authors: YS
authors: Feng
authors: Khalijah
authors: K
authors: Awang
authors: Seik Weng
authors: SW
authors: Ng
references: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references: 18156677
references: Phytochemistry. 1994 Mar;35(4):987-92
references: 7764631