3-Chloromethyl-1,2,4-triazolin-5-one252742-72-6100 % similar Urazole3232-84-644 % similar 6-(Chloromethyl)-2,4(1H,3H)-pyrimidinedione18592-13-739 % similar 2-(Chloromethyl)benzimidazole4857-04-931 % similar