Phthalazine 253-52-1 Benzo(d)pyridazine CCRIS 6894 EINECS 205-963-2 NSC 62484 beta-Phenodiazine P38706_ALDRICH NSC63241 InChI=1/C8H6N2/c1-2-4-8-6-10-9-5-7(8)3-1/h1-6 CHEBI:36597 ZINC00404458 .beta.-Phenodiazine 2,3-Benzodiazine 2,3-Diazanaphthalene Benzo[d]pyridazine NSC62484