2-imino-alanine 5-imidazolinone glycine (2-ethanimidoyl-5-oxo-4,5-dihydro-1H-imidazol-1-yl)acetic acid -64.01604461669921875 -64.04000091552734375 108.0323638916015625 108.09999847412109375 2,N-didehydroalanyl-5-imidazolinone glycine 2-(1-iminoethyl)-1-carboxymethyl-1-imidazolin-5-one 2-imino-alanine 5-imidazolinone glycine 2-imino-alanyl-5-imidazolinone glycine A protein modification that effectively crosslinks an L-aspartic acid residue and a glycine residue to form 2-imino-alanine 5-imidazolinone glycine. C -1 H -4 N 0 O -3 C 5 H 4 N 2 O 1 Cross-link 2; carboxamidine. D, G MOD:00820 PSI-MOD [2-(1-iminoethyl)-5-oxo-4,5-dihydro-imidazol-1-yl]-acetic acid alanyl-5-imidazolinone glycine natural para-hydroxybenzylidene-imidazolidinone chromophore red fluorescent protein zRFP574 chromophore 5-imidazolinone ring crosslinked residues (Gly) crosslinked L-aspartic acid residue crosslinked glycine residue