4'-(L-tryptophan)-L-tryptophyl quinone 2,4-BisTrp-6,7-dione (from Tryptophan) 2-amino-3-[2-[2-amino-3-(2-carboxyethyl)-6,7-dioxo-1H-indol-4-yl]-1H-indol-3-yl]propanoic acid 27.958528518676757812 27.969999313354492188 3-[(2S)-2-amino-2-carboxyethyl]-4-(3-[(2S)-2-amino-2-carboxyethyl]-1H-indol-2-yl)-6,7-indolinedione 4'-tryptophan-tryptophylquinone 4-(2'-tryptophyl)tryptophan-6,7-dione 4-(L-tryptophan-2-yl)-L-tryptophyl quinone 400.117156982421875 400.3900146484375 A protein modification that effectively cross-links two L-tryptophan residues by a carbon-carbon bond to form 4'-(L-tryptophan)-L-tryptophyl quinone. C 0 H -4 N 0 O 2 C 22 H 16 N 4 O 4 CROSSLNK Tryptophan tryptophylquinone (Trp-Trp) Cross-link 2; secondary to RESID:AA0148; From DeltaMass: Average Mass: 28. MOD:00158 PSI-MOD TTQ W, W XLNK-4'Trp-TrpQ alpha,alpha'-diamino-6',7'-dihydro-6',7'-dioxo-(2,4'-bi-1H-indole)-3,3'-dipropanoic acid natural uniprot.ptm:PTM-0298 uncategorized crosslinked residues crosslinked L-tryptophan residue