Table 4.
Approximate natural abundance of selected ribose isotopologs carrying 13C.
| Isotopolog | Abundance [mol%] |
| [1-13C1] | 1.1 |
| [2-13C1] | 1.1 |
| [3-13C1] | 1.1 |
| [1,2-13C2] | 0.012 |
| [4,5-13C2] | 0.012 |
| [1,2,3-13C3] | 0.00013 |
| [3,4,5-13C3] | 0.00013 |
| [U-13C5] | 0.000000018 |
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