国产美女视频黄a视频免费|2019日韩中文字幕mv|国产91对白在线播放丿|精品影院|午夜少妇拍拍视频在线观看

DL-Pyroglutamic acid；(±)-2-Pyrrolidone-5-carboxylic acid；DL-5-Oxo-2-pyrrolidinecarboxylic acid；DL-2-

CAS No.: 149-87-1

C5H7NO3=129.1

Grade: BR

Content: ≥ 99.0%

Melting point: 180 ~ 185 ° C

Physicochemical properties: white fine powder crystal

Purpose: biochemical research

Save: RT