R-22.214.171.124 Isotopic deficiency is denoted in the formula by adding the italicized syllable 'def' immediately preceding, without a hyphen, the appropriate nuclide symbol.
Note: According to one's viewpoint, one may also use .
Examples to R-126.96.36.199
R-188.8.131.52 The name of an isotopically deficient compound may be formed by adding the italicized syllable def immediately preceding, without a hyphen, the appropriate nuclide symbol, both enclosed in square brackets and cited before the name or that part of the name that is isotopically modified.
See Table 18
Examples to R-184.108.40.206
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