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Drotaverine (also known as dihydroperparine or No‐Spa®) is an antispasmodic drug closely related to papaverin. Drotaverin also acts as a cytostatic compound for several human tumor cell lines and nonmalignant mouse fibroblasts, and EC50 values as low as 3.0 μM were observed in SRB assays for HT‐29 human colorectal carcinoma cells. Small structural changes (e.g., aromatization, benzylic oxidation)...
Thirty-one different 3-O-acetyl-OA derived amides have been prepared and screened for their cytotoxic activity. In the SRB assays nearly all the carboxamides displayed good cytotoxicity in the low μM range for several human tumor cell lines. Low EC50 values were obtained especially for the picolinylamides 14–16, for a N-[2-(dimethylamino)-ethyl] derivative 27 and a N-[2-(pyrrolinyl)-ethyl] carboxamide...
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