1,8-Diazafluoren-9-one Names IUPAC name 9H-pyrido[3',2':3,4]cyclopenta[1,2-b]pyridin-9-one Other names DFO 9H-1,8-Diazafluoren-9-one 9H-Cyclopenta[1,2-b:4,3-b']dipyridin-9-one Identifiers CAS Number 54078-29-4 Y[chemspider] 3D model (JSmol) Interactive image Interactive image ChemSpider 633891 Y PubChem CID 725961 CompTox Dashboard (EPA) DTXSID10352406 InChI InChI=1S/C11H6N2O/c14-11-9-7(3-1-5-12-9)8-4-2-6-13-10(8)11/h1-6H Y Key: FOSUVSBKUIWVKI-UHFFFAOYSA-N Y InChI=1/C11H6N2O/c14-11-9-7(3-1-5-12-9)8-4-2-6-13-10(8)11/h1-6H Key: FOSUVSBKUIWVKI-UHFFFAOYAH SMILES O=C1C3=C(C=CC=N3)C2=C1N=CC=C2 O=C3c1ncccc1c2c3nccc2 Properties Chemical formula C11H6N2O Molar mass 182.18 g/mol Melting point 229 to 233 °C (444 to 451 °F; 502 to 506 K) Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references