Isotopically Modified Compounds
R-8.1.4 Isotopically modified compounds An isotopically modified compound has a macroscopic composition such that the isotopic ratio of nuclides for at least one element deviates measurably from that occurring in
nature. Isotopically modified compounds may be classified as isotopically substituted (R-8.2) or as isotopically labelled (R-8.3). Isotopically labelled compounds
may be further classified as specifically labelled (R-8.3.1), selectively labelled(R-8.3.2), nonselectively labelled(R-8.3.3), or isotopically deficient
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