Abstract
Two new compounds 4-methyl-heptadec-6-enoic acid ethyl ester (2) and 3-hydroxy-2,9,11-trimethoxy-5,6-dihydro isoquino[3,2-a]isoquinolinylium (7) were isolated from an ethanolic extract of the stems of Tinospora sinensis, along with six known compounds (1, 3–6 and 8). The structures of new compounds were established on the basis of detailed spectroscopic studies. Compound 7 exhibited the highest in vitro antileishmanial activity against Leishmania donovani promastigotes and intracellular amastigotes, whereas compounds 2, 4, 5 and 6 demonstrated moderate activity. Other compounds were found to be inactive. †CDRI Communication No. 7405.
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