C1=CC=C2C(=C1)C(=CN2)CC(C(=O)O)N
['13H', 'C₁₁H₁₂N₂O₂', 'QIVBCDIJIAJPQS-VIFPVBQESA-N', 'http://commons.wikimedia.org/wiki/Special:FilePath/L-Tryptophan%20-%20L-Tryptophan.svg', 'C1=CC=C2C(=C1)C(=CN2)CC(C(=O)O)N', 'DTXCID801419', ' DL-tryptophan', '8DUH1N11BX', 'amino acid that cannot be synthesized de novo by the organism']