Tryptophan
C₁₁H₁₂N₂O₂·204.229 g/mol·Amino Acids·CID 6305
Amino AcidEssential
An essential amino acid with a large indole side chain. Precursor to serotonin and melatonin. The least abundant amino acid in most proteins. Often cited (incorrectly) as the cause of post-Thanksgiving drowsiness.