CAS 877052-29-4 appears in our catalog under these names: Ethyl 4-[(5-methyl-1,3,4-thiadiazol-2-yl)thio]-3-oxobutanoate, 95%, Ethyl 4-((5-methyl-1,3,4-thiadiazol-2-yl)thio)-3-oxobutanoate, 97%. Offered by: Combi-blocks, AmBeed. Available pack sizes: 1g, 5g.