4-(氨基甲基)苯甲酸叔丁酯 、
(6R)-2-chlorophenyl 6-(5-chloro-2-methoxybenzyl)-3,7-dioxo-4-(2,4,6-trimethoxybenzyl)-1,4-diazepan-1-carboxylate 以to obtain tert-butyl 4-{[({(6R)-6-(5-chloro-2-methoxybenzyl)-3,7-dioxo-1,4-diazepan-1-yl}carbonyl)amino]methyl}benzoate (compound S47a)的产率得到tert-butyl 4-{[({(6R)-6-(5-chloro-2-methoxybenzyl)-3,7-dioxo-1,4-diazepan-1-yl}carbonyl)amino]methyl}benzoate