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"I"

isotope
Guideline or reference source
ISO11238 IDMP Data elements and structures for the unique identification and exchange of regulated information on substances
Definition
variants of a chemical element that differ by molecular mass   NOTE Radionuclides or nuclides with a non-natural isotopic ratio are shown in the structural representation with the nuclide number displayed. Natural abundance isotopes are represented by an elemental symbol without a nuclide number.   EXAMPLE 13C refers to a carbon atom that has an atomic mass of 13.  

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