L-tryptophan
(S)-a-amino-b-(3-indolil)-propionic acid

C11H12N2O2

It's an amino acid.

Synthesis of tryptophan (3D)
Catabolism of isoleucine, leucine and tryptophan (3D)
Catabolism of threonine, tryptophan, glycine, proline, alanine, cysteine and serine (3D)
Catabolism of tryptophan and lysine (3D)
Synthesis of aminoacyl t-RNA (Kyoto University)