CAS 872-50-4 appears in our catalog under these names: 1-Methyl-2-Pyrrolidone, Piracetam Impurity 8, 1-Methyl-2-pyrrolidinone, >95% (HPLC), 1-Methyl-2-pyrrolidon, N-Methylpyrrolidone. Offered by: Chemat Brand, Hubei YoungXin, TRC, Dr. Ehrenstorfer, Mikromol. Available pack sizes: on request, 10mg, 25mg, 50mg, 100mg, 200mg, 10g, 1g.