butinoline butinoline butinoline (azulone) is an anticholinergic drug used as an antispasmodic. butinoline names preferred iupac name 1,1-diphenyl-4-(pyrrolidin-1-yl)but-2-yn-1-ol identifiers cas number 968-63-8 3d model (jsmol) interactive image chembl chembl1442660 chemspider 62168 pubchem cid 68943 unii g216926e9t comptox dashboard (epa) dtxsid3046295 inchi inchi=1s/c20h21no/c22-20(18-10-3-1-4-11-18,19-12-5-2-6-13-19)14-9-17-21-15-7-8-16-21/h1-6,10-13,22h,7-8,15-17h2key: lwpxjpfoepmirg-uhfffaoysa-ninchi=1/c20h21no/c22-20(18-10-3-1-4-11-18,19-12-5-2-6-13-19)14-9-17-21-15-7-8-16-21/h1-6,10-13,22h,7-8,15-17h2key: lwpxjpfoepmirg-uhfffaoyav smiles c1ccn(c1)cc#cc(c2=cc=cc=c2)(c3=cc=cc=c3)o properties chemical formula c20h21no molar mass 291.4 g/mol except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references