Two non-superposable @C01255@ that correspond to the same @C01288@ are considered to be diastereomeric if they are not mirror images.
Source: Purple Book, 1st ed., p. 27 [Terms] [Book]
Citation: 'diastereoisomeric units' in IUPAC Compendium of Chemical Terminology, 3rd ed. International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. https://doi.org/10.1351/goldbook.D01677 RISBibTexEndNote