10-O-acylated iridoid glucosides from leaves of Premna subscandens

Article abstract of DOI:10.1016/S0031-9422(97)80017-9

From the 1-butanol-soluble fraction of a methanol extract of leaves of Premna subscandens, collected on Ishigaki Island, Okinawa, ten 10-O-acylated derivatives of catalpol and asystasioside E were isolated. The structures of nine new compounds were elucidated by spectroscopic methods and by chemical conversion.