<unk>  (isotopic isomers) are isomers having the same number of each isotopic atom but differing in their positions. For example, CH3CHDCH3 and CH3CH2CH2D are a pair of constitutional<unk> . An<unk> should not be confused with an isotopologue.
Isotopomers
Isomer
Oligomer
Nuclear isomer
Foldamers
Enantiomer
Capsid
SI prefix