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Novel semisynthetic derivatives of betulin and betulinic acid with cytotoxic ac...

A series of new imidazole carboxylic esters (carbamates) and N-acylimidazole derivatives of betulin and betulinic acid (14-29) have been synthesized. The new compounds were screened for in vitro cytotoxicity activity against human cancer cell lines HepG2, Jurkat and HeLa. A number of compounds have shown IC50 values lower than 2 [mu]M against the cancer cell lines tested and the vast majority has shown a better...