1(2H)-PHTHALAZINONE 1(2H)Phthalazinone 1-Phthalazinol 119-39-1 5418-26-8 CCRIS 4860 EINECS 204-319-8 HSDB 4310 NSC 10432 Phthalazin-1-one Phthalazinone Phthalazone