Alkali metal salts of N-(C1-C5)alkyl- or N-(C1-C5)hydroxyalkyl-2-pyrrolidone-4-carboxylic acids and compositions containing them are useful as humectants, particularly in topical cosmetic and pharmaceutical compositions.
N-(C1-C5)alkyl- 或 N-(C1-C5)hydroxyalkyl-2-pyrrolidone-4-carboxylic acids 的碱
金属盐和含有它们的组合物可用作保湿剂,特别是在局部化妆品和药物组合物中。