Oligomeric secoiridoid glycosides with hepatoprotective activity from the flowers of Jasminum sambac (L.) Aiton.

A methanol extract of the flowers of Jasminum sambac (L.) Aiton (Oleaceae) exhibited hepatoprotective effects against d-galactosamine (D-GalN)/lipopolysaccharide-induced liver injury in mice. Five previously undescribed oligomeric secoiridoid glycosides, jasminumosides A-E (1-5), were isolated from the extract, along with 19 known compounds (6-24). The structures of 1-5 were determined based on their spectroscopic properties and chemical evidence. Among the isolates, three oligomeric secoiridoid glycosides, sambacoside A (6) and molihuasides C (10) and D (11), exhibited hepatoprotective effects at doses ranging between 12.5 and 25 mg/kg, p.o.