: N-[[4-[[(Diphenylmethoxy)carbonyl]amino]-2-oxo-1(2H)-pyrimidinyl]acetyl]-N-[2-[[(9H-fluoren-9-ylmethoxy)carbonyl]amino]ethyl]glycine, N-[2-[[[(9H-Fluoren-9-yl)methoxy]carbonyl]amino]ethyl]-N-[2-[4-[[(benzhydryloxy)carbonyl]amino]-2-oxopyrimidin-1(2H)-yl]acetyl]glycine