An active metabolite of Hydralazine in vivo.Synonyms:2-[2-(1-Phthalazinyl)hydrazinylidene]propanoic Acid; 2-(1-Phthalazinylhydrazono)propanoic Acid; 1-Phthalazinylhydrazone Pyruvic Acid;CAS Number:67536-13-4Molecular Formula.:C₁₁H₁₀N₄O₂Molecular Weight:230.22