<chemical> N'-(1-phthalazinyl)-hydrazinecarboxylic acid ethyl ester. An antihypertensive agent with both central and peripheral action; it has some central nervous system depressant effects. ... Pharmacological action: antihypertensive agents. ... Chemical name: Hydrazinecarboxylic acid, 2-(1-phthalazinyl)-, ethyl ester, monohydrochloride ......