Vardenafil EP Impurity C Catalogue F341503 CAS 1255919-03-9 M.W 834.97 M.F C38H46N10O8S2 Specifications FAQs 2,2'-((piperazine-1,4-disulfonyl)bis(6-ethoxy-3,1-phenylene))bis(5-methyl-7-propylimidazo[5,1-f][1,2,4]triazin-4(3H)-one)
