title: Ethoxy-carbonyl-methyl ursolate.
abstract: The title compound, C(34)H(54)O(5), was synthesized by the reaction of ursolic acid with ethyl chloro-acetate in the presence of DMA. All six-membered rings of the penta-cyclic triterpene skeleton adopt chair conformations. In the crystal structure, mol-ecules are linked by inter-molecular O-H⋯O hydrogen-bond inter-actions, forming zigzag chains along the c axis.
authors.affiliation: College of Chemistry, Sichuan University, Chengdu 610064, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Yang
authors.forename: Hua-Ling
authors.initials: HL
authors.lastname: Luo
authors.forename: Cong-Ling
authors.initials: CL
authors.lastname: Yang
authors.forename: Shu-Fan
authors.initials: SF
authors.lastname: Yin
authors.forename: Ying
authors.initials: Y
authors.lastname: Li