在线观看国产精品日韩av,毛色毛片免费观看,久久无码人妻精品一区二区三区,亚洲人成电影网站色-西西人体大胆午夜啪啪_亚洲 欧美 偷自乱 图片_国产激情З∠视频一区二区_亚洲AV

Welcome to visit Changzhou Chengbang Chemical Co., Ltd. official website!

CollectionHomepage中文版

More>>
1-Methyl-2-pyrrolidinone
Product name: 1-Methyl-2-pyrrolidinone
CAS NO: 872-50-4;2687-44-7
Molecular weight: 99.13 
EC NO: 212-828-1
Molecular formula: C5H9NO
InChI: InChI=1/C5H9NO/c1-6-4-2-3-5(6)7/h2-4H2,1H3
Structural formula:
  Order                   Back