pipoxizine pipoxizine pipoxizine (inn) is a first-generation antihistamine as well as serotonin antagonist of the diphenylmethylpiperazine group related to hydroxyzine. it was investigated as a bronchodilator but was never marketed. pipoxizineclinical dataatc codenoneidentifiers iupac name 2-(2-ethoxy)ethanol cas number55837-21-3pubchem cid68750chemspider61995uniib9a98d632zchemical and physical dataformulac24h31no3molar mass381.516 g·mol−13d model (jsmol)interactive image smiles c1ccc(cc1)c(=c2ccn(cc2)ccoccocco)c3ccccc3 inchi inchi=1s/c24h31no3/c26-16-18-28-20-19-27-17-15-25-13-11-23(12-14-25)24(21-7-3-1-4-8-21)22-9-5-2-6-10-22/h1-10,26h,11-20h2key:scmpxorbotwfti-uhfffaoysa-n