isomers

optical isomers positional isomers structural isomers geometric isomers nuclear isomers cis-trans isomers metastable isomers valence isomers geometric isomer cis-trans isomer [化] 顺反异构体 structural isomer [化] 结构同分异构体 optical isomer [化] 旋光异构体; 旋光异构物 positional isomer [机] 位置异构物 metastable isomer valence isomer