CAS 57-13-6 appears in our catalog under these names: Fluorouracil Impurity 7（Fluorouracil EP Impurity G）, Urea, 98+% , Urea, ACS, 99.0-100.5% , Urea, 99.3+% , Urea, ultrapure, 99% . Offered by: Hubei YoungXin, Thermo Scientific (Alfa Aesar). Available pack sizes: 10mg, 25mg, 50mg, 100mg, 200mg, 10000g, 2500g, 500g.