Cinnoline 253-66-7 CHEBI:36617 alpha-phenodiazine EINECS 205-964-8 InChI=1/C8H6N2/c1-2-4-8-7(3-1)5-6-9-10-8/h1-6 .alpha.-Phenodiazine 1,2-Benzodiazine 1,2-Diazanaphthalene Benzo[c]pyridazine NSC58374