Alkaloids from the stems of Merr. inhibit the proliferation of synoviocytes.

Two new aporphine-derived alkaloids, aporaloids C and D ( and ), along with eight known biogenetically related alkaloids (-) were isolated from the stems of Merr. Their structures were elucidated by detailed analysis of NMR, HRESIMS, MS, IR, UV and Optical rotations data. Compounds and represent a rare example of -methylol aporphine-derived alkaloids from natural sources.