SMILES: C1=CC=C2C(=C1)C(=CN2)C[C@@H](C(=O)[O-])[NH3+]
Description: The molecule is an L-alpha-amino acid zwitterion obtained by transfer of a proton from the carboxy to the amino group of L-tryptophan; major species at pH 7.3. It is a tryptophan zwitterion and a L-alpha-amino acid zwitterion. It is a tautomer of a L-tryptophan.