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The title compound, erioflorin, C 19 H 24 O 6 [systematic name: (1a R ,3 S ,4 Z ,5a R ,8a R ,9 R ,10a R )-1a,2,3,5a,7,8,8a,9,10,10a-deca-hydro-3-hy-droxy-4,10a-dimethyl-8-methyl-idene-7-oxooxireno[5,6]cyclo-deca-[1,2- b ]furan-9-yl methacrylate], is a tricyclic germacrane sesquiterpene lactone, which was isolated from Podanthus mitiqui (L.). The compound crystallizes in the space group P 2 1 2 1 2 1 , and its mol-ecular structure consists of a methacrylic ester of a ten-membered ring sesquiterpenoid annelated with an epoxide and a butyrolactone. The structure is stabilized by one intramolecular C-H⋯O hydrogen bond. An O-H⋯O hydrogen bond and further C-H⋯O interactions can be observed in the packing.

Crystal structure of erioflorin isolated fromPodanthus mitiqui(L.)