Acylated anthocyanins from the flowers of Ipomoea asarifolia

Among several anthocyanins detected in the flowers of Ipomoea asarifolia, two acylated anthocyanins were isolated and studied using chemical, GC, mass spectrometric and extensive NMR methods (TOCSY-1D, DQF-COSY and HMBC measurements). The first anthccyanin was identified as cyanidin 3-O-[2-O-(6-O-(E-caffeoyl)-β-d-glucopyranosyl)-6-O-(E-caffeoyl)-β-d-glucopyranoside]-5-O-[β-d- glucopyranoside], and the new structure as cyanidin 3-O-[2-O-(6-O-(E-p-coumaroyl)-β-d-glucopyranosyl)-6-O-(E-caffeoyl)-β-d-glucopyranoside]-5-O-[β-d- glucopyranoside.