SMILES: C1=CC=C2C(=C1)C(=CN2)C[C@H](C(=O)[O-])[NH3+]
Description: The molecule is zwitterionic form of D-tryptophan having an anionic carboxy group and a protonated alpha-amino group; major species at pH 7.3. It is a tautomer of a D-tryptophan.