atiprosin atiprosin atiprosin (developmental code name ay-28,228) is an antihypertensive agent which acts as a selective α1-adrenergic receptor antagonist. it also possesses some antihistamine activity, though it is some 15-fold weaker in this regard than as an alpha blocker. it was never marketed. atiprosinclinical dataother namesay-28,228routes ofadministrationoralatc codenoneidentifiers iupac name (4ar,12bs)-1-ethyl-12-methyl-4-(propan-2-yl)-1,2,3,4,4a,5,6,12b-octahydropyrazinopyridoindole cas number89303-63-9 npubchem cid71770chemspider64808 yuniials52889wfchemblchembl2111172 nchemical and physical dataformulac20h29n3molar mass311.473 g·mol−13d model (jsmol)interactive image smiles n23c1ccccc1c(c24n(ccn(4cc3)c(c)c)cc)c inchi inchi=1s/c20h29n3/c1-5-21-12-13-22(14(2)3)18-10-11-23-17-9-7-6-8-16(17)15(4)19(23)20(18)21/h6-9,14,18,20h,5,10-13h2,1-4h3/t18-,20+/m1/s1 ykey:wxnvfyibelasjw-quccmnqesa-n y ny (what is this?) (verify)