No abstract

From Mitraria coccinea Cav. (Gesneriaceae), five strongly bitter labdane glycosides named mitrariosides A1, A2, B, C and D (1 — 5) were obtained. The structures were deduced by chemical and spectroscopic evidence (COSY, 13C‐1H CORR, NOESY and MS‐FAB) and found to be: mitrarioside A1 (1): (6S)‐19‐(β‐D‐galactopyranosyloxy)‐6‐hydroxy‐15‐(α‐Lrhamno‐pyranosyloxy)labda‐8(17),13‐diene, mitrarioside A2 (2): (6S)‐19‐(β‐D‐glucopyranosyloxy)‐6‐hydroxy‐15‐(α‐L‐rhamnopyranosyloxy)labda‐8(17),13‐diene, mitrarioside B (3):(6S)‐19‐(β‐D‐glucopyranosyloxy)‐6‐hydroxy‐15‐(β‐D‐glucopyranosyloxy)‐labda‐8(17),13‐diene, mitrarioside C (4): (6S)‐19‐(β‐D‐glucopyranosyloxy)‐6,15‐dihydroxylabda‐8(17), 13‐diene, and mitrarioside D (5): (6S)‐19‐(α‐L‐rhamnopyranosyloxy)‐6,15‐dihydroxy‐labda‐8(17),13‐diene. The known compounds acteoside and calceolarioside C were also isolated.

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