Natural Product Research 2018-Apr
A new morphinandienone alkaloid from the stems of Fissistigma tungfangense.
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A new morphinandienone alkaloid, fissistigmine A (1), together with three known alkaloids (2-4), were isolated and identified from the stems of Fissistigma tungfangense. Among them, fissistigmine A (1) represents the first example of a novel naturally occurring morphinandienone alkaloid with a unique cleavage of the C-9-N-17 bond. All isolated compounds were evaluated for their anti-rheumatoid arthritis activities via examining their anti-proliferative effects on synoviocytes in vitro. Compound 1 exhibited inhibitory effect on the proliferation of synoviocytes with an IC50 value of 114.6 ± 2.2 μM.