The conformational feature in which a loop connects two parallel stems belonging to the same crystal.
Source: Purple Book, 1st ed., p. 83 [Terms] [Book]
Citation: 'chain folding' 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.C00953 RISBibTexEndNote