ethyl 1-(6-amino-9H-purin-9-yl)-1,3-dideoxy-3-amino-β-D-ribofuranuronate 、
N-tert-butoxycarbonyl-β-(4-tert-butoxycarbonylaminophenyl)-D,L-alanine 生成 ethyl 1-(6-amino-9H-purin-9-yl)-1,3-dideoxy-3-[N-tert-butoxycarbonyl-β-(4-tert-butoxycarbonylaminophenyl)-D,L-alanylamino]-β-D-ribofuranuronate