Studies on the constituents of Lonicera species. XVII. New iridoid glycosides of the stems and leaves of Lonicera japonica Thunb

Abstract

Four new iridoid glycosides, named L-phenylalaninosecologanin (1), 7-O-(4-β-D-glucopyranosyloxy-3-methoxybenzoyl) secologanolic acid (2), 6′-O-(7α-hydroxyswerosyloxy)loganin (3) and (Z)-aldosecologanin (5), were isolated, together with a known one, newly named (E)-aldosecologanin (4), from the stems and leaves of Lonicera japonica. Their structures were established on the basis of chemical and spectral data. © 2002 Pharmaceutical Society of Japan.