L-tryptophan (W)

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Some facts on L-tryptophan.

1. Abbreviation: Trp.
2. One-letter code: W, as in "double ring".
3. Molecular mass: 204 daltons.
4. Side chain (or R-group) features:
   • Structural formula:
     
   • Formula: -CH₂-indole;
   • Category: hydrophobic; aromatic.
   • pK_a: none.