trans-ethyl 2-(6-chloro-1-trityl-1H-pyrazolo[4,3-c]pyridin-3-yl)cyclopropanecarboxylate 、
(S)-1-(2-methoxy-1-phenylethyl)urea 以to provide trans-2-(6-(3-((S)-2-methoxy-1-phenylethyl)ureido)-1-trityl-1H-pyrazolo[4,3-c]pyridin-3-yl)cyclopropanecarboxylic acid的产率得到trans-2-(6-(3-((S)-2-methoxy-1-phenylethyl)ureido)-1-trityl-1H-pyrazolo [4,3-c]pyridin-3-yl)cyclopropanecarboxylic acid