Prefix abbreviation for Symmetrical, referring to the relative location of atoms, chain groups, or substituents groups in a cyclic compound. Two examples are sym-trioxane, 1,3,55-(CH2O)3, and 1,3,5-trinitrobenzene (the corresponding 1,2,4-isomer in each case being unsymmetrical). The prefix is usually ignored in alphabetizing lists of compound names.
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Gooch, J.W. (2011). Sym- (s-). In: Gooch, J.W. (eds) Encyclopedic Dictionary of Polymers. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6247-8_11477
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