| prov:value
| - the mass-modifying functionality is ???N3 or ???XR; X is selected from the group consisting of ???O???, ???NH???, ???NR???, ???S???, ???NHC(S)???, ???OCO(CH2)nCOO???, ???NHCO(CH2)nCOO???, ???OSO2O???, ???OCO(CH2)n???, ???NHC(S)NH???, ???OCO(CH2)nS???, ???OCO(CH2)S???, ???NC4O2H2S???, ???OPO(O-alkyl)-, and ???OP(O-alkyl)-; n is an integer from 1 to 20; and R is selected from the group consisting of
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