pyrrobutamine pyrrobutamine pyrrobutamine is an antihistamine and anticholinergic. pyrrobutamineclinical dataatc coder06ax08 (who) identifiers iupac name 1-pyrrolidine cas number91-82-7 ypubchem cid5284614chemspider4447659 nuniive6kp18s8xchemblchembl1697849 ncomptox dashboard (epa)dtxsid9023544 echa infocard100.001.911 chemical and physical dataformulac20h22clnmolar mass311.85 g·mol−13d model (jsmol)interactive image smiles c1ccn(c1)c/c=c(\cc2=cc=c(c=c2)cl)/c3=cc=cc=c3 inchi inchi=1s/c20h22cln/c21-20-10-8-17(9-11-20)16-19(18-6-2-1-3-7-18)12-15-22-13-4-5-14-22/h1-3,6-12h,4-5,13-16h2/b19-12+ nkey:wdyyvnnrtdzkaz-xdhozwipsa-n n ny (what is this?) (verify)