3-[4-(Phenylmethyl)-1-piperazinyl]-1-pyrrolidinecarboxylic Acid 1,1-Dimethylethyl Ester, is used as an intermediate in the synthesis of 3-(Piperazin-1-yl)pyrrolidine-1-carboxylic Acid tert-Butyl Ester (P479915). It can also be used in the synthesis of a a novel series of indazoles as ketohexokinase inhibitors, that are also shown to be lead-like compounds with good pharmaceutical properties.