1-Phenyl-3-(4-antipyryl)-2-thiourea 3-(4-Antipyrinyl)-1-phenyl-2-thiourea 4-25-00-03585 (Beilstein Handbook Reference) 51641-29-3 BRN 0323617 NSC 337611 Thiourea, N-(2,3-dihydro-1,5-dimethyl-3-oxo-2-phenyl-1H-pyrazol-4-yl)-N'-phenyl- (9CI) Urea, 3-(4-antipyrinyl)-1-phenyl-2-thio-