L-tyrosine D-tyrosine residue tyrosine residue proteinogenic amino-acid residue L-tyrosine residue L-tyrosyl PDBeChem:TYR_LL CHEBI:29975 Tyr L-tyrosine Y CHEBI:46207 RESID:AA0019 CHEBI:46858 L-tyrosine acid residue L-tyrosine residue L-alpha-amino acid residue amino-acid residue related to L-tyrosine