CAS: 306934-80-5 Molecular Formula: C5H6N2O4 Molecular Weight (g/mol): 158.113 MDL Number: MFCD09064936 InChI Key: DZCBVXKRERSHAA-UHFFFAOYSA-N PubChem CID: 2774651 IUPAC Name: 6-oxo-1H-pyridazine-3-carboxylic acid;hydrate SMILES: C1=CC(=O)NN=C1C(=O)O.O