L-Glutamic acid, N-(N-(N-(N-(N-(N-(N-(N-(4-(3-amino-1,2,5,6,6a,7-hexahydro-1-oxoimidazo(1,5-f)pteridin-8(9H)-yl)benzoyl)-L-gamma-glutamyl)-L-gamma-glutamyl)-L-gamma-glutamyl)-L-gamma-glutamyl)-L-gamma-glutamyl)-L-gamma-glutamyl)-L-gamma-glutamyl)-