We are the prefessional manufactor of amino acid in China. We provide high quality, lowest price and reliable service. (S)-(+)-5-Hydroxymethyl-2-pyrrolidinone CAS NO: 17342-08-4 molecular formula:C5H9NO2 molecular weight: 115.13 Meilting point: 78-86ºC Specificrotation: 30º(C=2,ETOH) purity：98% min