1-(2-diphenyl)piperazine 1-(2-diphenyl)piperazine 1-(2-diphenyl)piperazine, also known as ra-7, is a drug which acts as a potent and selective antagonist at the 5ht7 serotonin receptor. it was discovered as an active metabolite of the synthetic 5-ht7 agonists lp-12 and lp-211, and unexpectedly turned out to be a potent antagonist with selectivity approaching that of the parent molecules, despite its much simpler structure. 1-(2-diphenyl)piperazineidentifiers iupac name 1-(2-diphenyl)piperazine cas number180698-18-4 ypubchem cid2737389chemspider2019031 yuniit5s5265h6vchemblchembl494675 ychemical and physical dataformulac16h18n2molar mass238.334 g·mol−13d model (jsmol)interactive image smiles c3cnccn3c1ccccc1-c2ccccc2 inchi inchi=1s/c16h18n2/c1-2-6-14(7-3-1)15-8-4-5-9-16(15)18-12-10-17-11-13-18/h1-9,17h,10-13h2 ykey:rkrvrtjvcwzoqs-uhfffaoysa-n y (verify)