Hydrazinophthalazine
Hydrazinophthalazines are a class of antihypertensive drugs including: Hydralazine Dihydralazine Cadralazine Endralazine Chemically, the latter two aren't phthalazines; but they are classified as such in the World Health Organization's Anatomical Therapeutic Chemical Classification System. References Antihypertensive agents Phthalazines