1 1R4 L-gamma-glutamyl-S-[2-(4-nitrophenyl)-2-oxoethyl]-L-cysteinylglycine 1.000 2 GSO L-gamma-glutamyl-S-[(2s)-2-hydroxy-2-phenylethyl]-L-cysteinylglycine 0.906 3 GAZ L-gamma-glutamyl-3-{(E)-[2-(3,4-dimethoxyphenyl)-2-oxoethylidene]-lambda~4~-sulfanyl}-L-alanylglycine 0.806 4 48T L-gamma-glutamyl-S-(2-biphenyl-4-yl-2-oxoethyl)-L-cysteinylglycine 0.763 5 CNZ L-gamma-glutamyl-S-(2-biphenyl-4-yl-2-oxoethyl)-L-cysteinylglycine 0.763