Two triacylated and tetraglucosylated anthocyanins from Ipomoea asarifolia flowers.

Two triacylated and tetraglucosylated anthocyanins derived from cyanidin were isolated from the flowers of Ipomoea asarifolia and their structures elucidated using chemical, GC, MS and NMR methods (1H and 13C, TOCSY-1D, DQF-COSY, DIFFNOE and HMBC). These complex pigments were found to consist of cyanidin 3-O-[2-O-(6-O-E-caffeoyl-β-d-glucopyranosyl)]-{6-O-[4-O-(6-O-E-3,5-dihydroxycinnamoyl-β-d-glucopyranosyl)-E-caffeoyl]-β-d-glucopyranosyl}-5-O-β-d-glucopyranoside and cyanidin 3-O-[2-O-(6-O-E-p-coumaroyl-β-d-glucopyranosyl)]-{6-O-[4-O-(6-O-E-p-coumaroyl-β-d-glucopyranosyl)-E-caffeoyl]-β-d-glucopyranosyl}-5-O-β-d-glucopyranoside.