Cytotoxicity assay
Assay of cytotoxicity against human cancer cell lines in
vitro was performed by the tetrazolium dye (MTT) method
involving the ability of viable cells to convert the soluble 3-
(4,5)-dimethylthiazol-2,5-diphenyltetrazolium bromide into
the purple-colored formazan crystals [16,17]. The isolated
friedelane-type triterpenes were evaluated for their cytotoxicity