Abstract The growth inhibition of human cancer cells via T-type Ca 2+ channel blockade has been well known. Herein, a series of new 3, 4-dihydroquinazoline derivatives were synthesized via a brief SAR study on KYS05090 template and evaluated for both T-type Ca 2+ channel (Ca v 3.1) blockade and cytotoxicity on three human ovarian cancer cells (SK- OV-3, A2780 and A2780-T). Most of compounds except 6i generally exhibited more potent ...