dimethyl{5-[2-(1-methylamino-2-nitrovinylamino)ethylsulphiny
dimethyl{5-[2-(1-methylamino-2-nitrovinylamino)ethylsulphiny
英文命名为:(S)-2-(2,2-dimethyl-5-oxo-1,3-dioxolan-4-yl)acetic aci
有没有人知道 2,6-二甲基-1,3,5,7-辛四烯(2,6-Dimethyl-1,3,5,7-octatetraene
关于有机物的英文命名2,5-二甲基-4-(2-甲丙基)庚烷的英文命名是2,5- dimethyl-(2-methylpr
|-5 1/2-()| = |-5 1/2|+|()|
-2,-1,2,5,( )
1,2,5,( )
(a+1)^(-2/5)
5,1、2
1+2+5等于?
(-1/2)+(-2/5)+(+3/2)+(18/5)+(39/5)
2-(1/5+1/3)