Spec.: Appearance: colourless to light yellow liquid Assay: 98.5% min Packing: plastic drum CAS: 3470-99-3 we can provide purrolidone series, such as 1-Propyl-2-pyrrolidone 1-Butyl-2-pyrrodidone 1-Pentyl-2-pyrrolidone 1-Hexyl-2-pyrrolidone 1-Heptyl-2-pyrrolidone