crosslinked residues coelenterazine -50.036777496337890625 -50.060001373291015625 423.158294677734375 423.459991455078125 C 26 H 21 N 3 O 3 F, Y, Y Oplophorus luciferin MOD:01949 PSI-MOD hypothetical A protein modification that effectively cross-links a phenylalanine and two tyrosine residues to form coelenterazine. Cross-link 3. N-term coelenterazine C -1 H -6 O -2 8-benzyl-2-(4-hydroxybenzyl)-6-(4-hydroxyphenyl)imidazo[1,2-a]pyrazin-3(7H)-one crosslinked L-phenylalanine residue crosslinked L-tyrosine residue