A mixture of 2.2 g of N-[(3-carbamoyl)-5-(octadecyloxy)phenyl-N-[2-(phenylmethoxy)-2-oxoethyl]glycine phenylmethyl ester and 0.5 g of 10% palladium on carbon in 100 ml of THF was stirred in a hydrogen atmosphere at room temperature until uptake ceased after 3 hours. DMF (150 ml) was added and the mixture was heated to dissolve the precipitated product. The hot mixture was filtered to remove the catalyst and the filtrate was concentrated at reduced pressure to a solid. Recrystallization from THF gave 1.1 g (69% yield, mp 213°-216°) of N-(carboxymethyl)-N-[(3-carbamoyl)-5-(octadecyloxy)phenyl]glycine.
