Note: When only atoms of an element to be modified are present at the same position in a compound, only specific or selective labelling can result. Nonselectively labelling requires that the element to be modified be at different positions in the structure. For example, CH4 and can only be specifically or selectively labelled with a hydrogen isotope (see R-126.96.36.199 and R-188.8.131.52).
R-184.108.40.206 Nonselectively labelling is indicated in the formula by inserting the nuclide symbol, enclosed in square brackets, directly before the usual line formula with no locants or subscripts.
R-220.127.116.11 The name of a nonselectively labelled compound is formed in the same way as the name of a selectively labelled compound but contains neither locants nor subscripts in the nuclide descriptor.
Examples to R-18.104.22.168
Examples to R-22.214.171.124
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