甲烷的四个氢被四个甲基取代多少个碳原子共平面

2500800-92-8 1636177-43-9 2251702-41-5 1028342-58-6 2254559-76-5 1858211-14-9 1372703-10-0 260794-93-2 870134-85-3 858760-60-8 35107-03-0 3102128-56-0 2982740-43-0 2733236-36-5 2726596-93-4 26796-44-1 25189-69-9 156942-08-4 14341-94-7 1425094-28-5 13701-61-6 130904-74-4 3032167-61-3 958638-35-2 1642330-89-9 1186490-24-3 2616638-03-8 1415386-37-6 2105955-52-8 803731-74-0

934293-92-2 934294-22-1 934387-35-6 934461-40-2 93449-31-1 934662-91-6 934740-33-7 Urelumab 934828-12-3 93523-67-2 935283-04-8 17-羟基异千金二萜醇 935840-35-0 1-甲基-5-硝基-2-羟甲基咪唑 936345-35-6 936350-00-4 936446-61-6 936563-87-0 936749-56-3 连翘酯苷E 93755-85-2 937735-00-7 Difamilast 937812-80-1 938435-69-9 二丁酰环磷腺苷钙 3-羟基香豆素 939375-07-2 939681-36-4 939805-30-8