CAS 56-04-2 appears in our catalog under these names: 6-Methyl-2-thiouracil, 6-Methyl-2-thiouracil, 98% , 4(6)-METHYL-2-THIOURACIL, 6-Methyl-2-thiouracil, 98%, 6-Methyl-2-thiouracil, >95% (HPLC). Offered by: Dr. Ehrenstorfer, Sigma-Aldrich, HPC Standards, Thermo Scientific (Alfa Aesar), Fluorochem. Available pack sizes: 100mg, 50MG, 1x250mg, 50g, 250g, 1kg, 100G, 500g.