CAS 65322-79-4 appears in our catalog under these names: 4-Ethyl-2,3-dioxo-piperazine-1-carboxylic acid anilide, 95%, Piperacillin Impurity 23, 4-Ethyl-2,3-dioxopiperazine-1-carboxylic acid anilide, 95%, 95%. Offered by: Combi-blocks, Chemat Brand, Chemat. Available pack sizes: 5g, 1g, 250mg, on request, 10g.