| Label | Id | |
|---|---|---|
| 4'-tryptophan-tryptophylquinone | 20251 | |
| 4-(2'-tryptophyl)tryptophan-6,7-dione | 20251 | |
| 4'-(L-tryptophan)-L-tryptophyl quinone | 20251 | |
| alpha,alpha'-diamino-6',7'-dihydro-6',7'-dioxo-(2,4'-bi-1H-indole)-3,3'-dipropanoic acid | 20251 | |
| TTQ | 20251 | |
| tryptophan tryptophylquinone residue | 20251 |