L-Tryptophan-c’,α,β,γ,δ1,ε2,ε3,η2-13C8,β2,ζ2,ζ3-D3,15N

• Original SAIL amino acid
• Preservation of through-bond connectivity
• Reduction of spin diffusion
• Removal of ²J_HH couplings
• Reduction of number of protons 50%