| L-Trp | The optically active L-form of tryptophan |
| D-Trp | The optically active D-form of tryptophan |
| h-Trp | Protiated tryptophan |
| d-Trp | Deuterated tryptophan |
| d-L-Trp | Deuterated L-form of tryptophan |
| d-D-Trp | Deuterated D-form of tryptophan |
| L-Trp | The optically active L-form of tryptophan |
| D-Trp | The optically active D-form of tryptophan |
| h-Trp | Protiated tryptophan |
| d-Trp | Deuterated tryptophan |
| d-L-Trp | Deuterated L-form of tryptophan |
| d-D-Trp | Deuterated D-form of tryptophan |