Amino Acid. Aromatic, uncharged, nonpolar, extremely hydrophobic. The largest of the amino acids, contains two ring structures that share a common side. One ring is 6-sided, the other 5-sided, with a nitrogen atom as a member of one corner of the 5-sided ring and the amino acid backbone attached to another corner of the 5-sided ring.

Formula: C11H12N2O2
Molecular Weight: 204.23
Three-letter code: Trp
One-letter code: W