In an effort to discover new candidates with improved antimicrobial activities, we synthesized and studied invitro antimicrobial activities of various series of 3-((thiophen-2-yl)-ethyl)-2- (styryl)-quinazolin-4 (3H)-one (3a-3g) and N1-(substituted aryl)-N3-[3-((3, 4-dimethoxy phenyl-2-yl)-ethyl)-4 (3H)-quinazolone-2-yl]-acetonyl semicarbazides (7a-7j) with an intent to overcome multiple drug resistance to the pathogenic strains and to retain psychological ...