CAS 188937-40-8 appears in our catalog under these names: Ethyl 4-chloro-2-thien-2-ylpyrimidine-5-carboxylate, 95%, 4-Chloro-2-thiophen-2-yl-pyrimidine-5-carboxylic acid ethyl ester, 95.0%. Offered by: Combi-blocks, Fluorochem. Available pack sizes: 250mg, 1g, 500mg.