1 FVF O-((((N-phenyl-methoxy-carbonyl)-phenyl alanyl-carbonyl)amino)-isobutyl)hydroxy phosphinyl)-3-phenylacetic acid 1.000 2 ZAF O-(((1r)-((N-phenylmethoxycarbonyl-L-alanyl)amino)ethyl)hydroxyphosphono)-L-benzylacetic acid 0.805 3 AGF O-(((1r)-((N-(phenyl-methoxy-carbonyl)-alanyl)-amino)methyl)hydroxyphosphinyl)3-L-phenyllactate 0.780