A series of carbamic acid 1-phenyl-3-(4-phenyl-piperazine-1-yl)-propyl esterderivatives were synthesized through discovery strategies for balancing target-based in vitro screening and phenotypic in vivo screening. All the newly synthesized compounds were screened for their analgesic activities and compared with standard drug morphine. Among them, compound 44r, a potent analgesic agent that has favorable