adibendan adibendan adibendan is an inhibitor of phosphodiesterase 3. it has been tested in dogs for its effects on heart output and dilation of blood vessels. adibendan names preferred iupac name 7,7-dimethyl-2-(pyridin-4-yl)-5,7-dihydroimidazoindol-6(1h)-one identifiers cas number 100510-33-6 3d model (jsmol) interactive image chembl chembl25931 chemspider 59277 pubchem cid 65867 unii e87n3l27kx comptox dashboard (epa) dtxsid30143358 inchi inchi=1s/c16h14n4o/c1-16(2)10-7-12-13(8-11(10)20-15(16)21)19-14(18-12)9-3-5-17-6-4-9/h3-8h,1-2h3,(h,18,19)(h,20,21)key: tvlqbbhundmtec-uhfffaoysa-ninchi=1/c16h14n4o/c1-16(2)10-7-12-13(8-11(10)20-15(16)21)19-14(18-12)9-3-5-17-6-4-9/h3-8h,1-2h3,(h,18,19)(h,20,21)key: tvlqbbhundmtec-uhfffaoyag smiles cc1(c2=cc3=c(c=c2nc1=o)nc(=n3)c4=cc=nc=c4)c properties chemical formula c16h14n4o molar mass 278.315 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references