SMILES: COC1=CC2=C(C=C1)NC=C2C[C@@H](C(=O)[O-])[NH3+]
Description: The molecule is a zwitterion obtained by transfer of a proton from the carboxy to the amino terminus of 5-methoxy-L-tryptophan; major species at pH 7.3. It is a tautomer of a 5-methoxytryptophan.