Tricalysiosides H-O: Ent-kaurane glucosides from the leaves of Tricalysia dubia

From the leaves of Tricalysia dubia, eight ent-kaurane glucosides were isolated. The structure of tricalysioside H (1) was established by X-ray crystallography and those of tricalysiosides I-O (2-8) were elucidated by analysis of spectroscopic evidence.