100840-34-4 Glycine, L-gamma-glutamyl-S-(2-(2-amino-1,6-dihydro-6-oxo-7H-purin-7-yl)ethyl)-L-cysteinyl- L-gamma-Glutamyl-S-(2-(2-amino-1,6-dihydro-6-oxo-7H-purin-7-yl)ethyl)-L-cysteinylglycine