prov:value
| - wherein a single or double bond can be present between C2 and C3, R1 is a methyl or a substituted or unsubstituted hydroxymethyl group, R2 is H, OH, a substituted or unsubstituted phosphate or a substituted or unsubstituted pyrophosphate, X1, X2, X3 and X4 are selected from the group comprising O, CHF, CHCl, CFCl, CH2, CF2 or CCl2, and R3, R4 and R5 are selected from the group comprising hydrogen,
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