iodouridine monophosphate derivatized residue modified L-tryptophan residue iodouridine monophosphate derivatized tryptophan 322.02020263671875 322.170013427734375 508.099517822265625 508.3699951171875 MOD:01249 PSI-MOD none C 20 H 21 N 4 O 10 P 1 This has a carbon-nitrogen linkage and not a phosphodiester linkage with UMP. C 9 H 11 N 2 O 9 P 1 artifact IodoU-AMP Cross-link of (Iodo)-uracil MP with W,F,Y A protein modification that is produced by reaction of iodouridine monophosphate with an L-tryptophan residue. W