Flacourside, a new 4-oxo-2-cyclopentenylmethyl glucoside from the fruit juice of Flacourtia indica

A new glucoside ester, named flacourside, has been isolated together with known methyl 6-O-(E)-p-coumaroyl glucopyranoside and 6-O-(E)-p-coumaroyl glucopyranose from the n-butanol extract of fruit juice of the Flacourtia indica. The structure of flacourside has been determined to be 4-oxo-2-cyclopentenylmethyl 6-O-(E)-p-coumaroyl-β-d-glucopyranoside on the basis of spectroscopic studies.