fenquizone fenquizone fenquizone (inn) is a diuretic, part of the class of low-ceiling sulfonamide diuretics. fenquizone is used primarily in the treatment of oedema and hypertension. fenquizoneclinical dataatc codec03ba13 (who) identifiers iupac name 7-chloro-4-oxo-2-phenyl-1,2,3,4-tetrahydroquinazoline-6-sulfonamide cas number20287-37-0pubchem cid68548chemspider61822 yuniilj1u13r8ikkeggd04161 yecha infocard100.039.702 chemical and physical dataformulac14h12cln3o3smolar mass337.78 g·mol−13d model (jsmol)interactive image smiles o=s(=o)(c3c(cl)cc2c(c(=o)nc(c1ccccc1)n2)c3)n inchi inchi=1s/c14h12cln3o3s/c15-10-7-11-9(6-12(10)22(16,20)21)14(19)18-13(17-11)8-4-2-1-3-5-8/h1-7,13,17h,(h,18,19)(h2,16,20,21) ykey:dbdtuxmdtstpqz-uhfffaoysa-n y (verify)