7-[2S-(3-hydroxy-4-naphthalen-2-yl-butyl)-5-oxo-pyrrolidin-1-yl]-heptanoic acid ethyl ester 、
5-{3-[2-oxo-5S-(3-oxo-4-thiophen-2-yl-butyl)-pyrrolidin-1-yl]-propyl}-thiophene-2-carboxylic acid methyl ester 在
sodium tetrahydroborate 作用下,
生成 5-{3-[2S-(3-hydroxy-4-thiophen-2-yl-butyl)-5-oxo-pyrrolidin-1-yl]-propyl}-thiophene-2-carboxylic acid methyl ester