spirendolol spirendolol spirendolol is a beta adrenergic receptor antagonist. spirendolol names iupac name 4-spiro-1-one identifiers cas number 65429-87-0 y 3d model (jsmol) interactive image chemspider 62090 pubchem cid 68857 unii 96789094br y inchi inchi=1s/c21h31no3/c1-20(2,3)22-13-15(23)14-25-18-9-7-8-16-17(18)12-21(19(16)24)10-5-4-6-11-21/h7-9,15,22-23h,4-6,10-14h2,1-3h3key: ylbmsizztjeeio-uhfffaoysa-ninchi=1/c21h31no3/c1-20(2,3)22-13-15(23)14-25-18-9-7-8-16-17(18)12-21(19(16)24)10-5-4-6-11-21/h7-9,15,22-23h,4-6,10-14h2,1-3h3key: ylbmsizztjeeio-uhfffaoyab smiles cc(c)(c)ncc(coc1=cc=cc2=c1cc3(c2=o)ccccc3)o properties chemical formula c21h31no3 molar mass 345.483 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references