1-Phthalazinone
| Name of Impurity/Standard | 1-Phthalazinone |
| CAS No. | 119-39-1 |
| Molecular Formula | C₈H₆N₂O |
| Molecular Weight | 146.15 g/mol |
| Synonyms: Phthalazinone; Azelastine impurity; 1-Hydroxyphthalazine; 1-Oxophthalazine; 1-Phthalazinol; ICX 56225770; NSC 10432; NSC 52567; Phthalazin-1-one; | |