4'-(L-tryptophan)-L-tryptophyl quinone 27.958528518676757812 27.969999313354492188 400.117156982421875 400.3900146484375 C 22 H 16 N 4 O 4 A protein modification that effectively cross-links two L-tryptophan residues by a carbon-carbon bond to form 4'-(L-tryptophan)-L-tryptophyl quinone. 4-(L-tryptophan-2-yl)-L-tryptophyl quinone H -4 O 2 PSI-MOD MOD:00158 W, W none 4'-tryptophan-tryptophylquinone natural 2,4-BisTrp-6,7-dione (from Tryptophan) Cross-link 2; secondary to RESID:AA0148; From DeltaMass: Average Mass: 28. 3-[(2S)-2-amino-2-carboxyethyl]-4-(3-[(2S)-2-amino-2-carboxyethyl]-1H-indol-2-yl)-6,7-indolinedione 4-(2'-tryptophyl)tryptophan-6,7-dione CROSSLNK Tryptophan tryptophylquinone (Trp-Trp) TTQ alpha,alpha'-diamino-6',7'-dihydro-6',7'-dioxo-(2,4'-bi-1H-indole)-3,3'-dipropanoic acid 2-amino-3-[2-[2-amino-3-(2-carboxyethyl)-6,7-dioxo-1H-indol-4-yl]-1H-indol-3-yl]propanoic acid XLNK-4'Trp-TrpQ uncategorized crosslinked residues crosslinked L-tryptophan residue