The diastereoselectivity for the hydrolysis of Z-D(L)-Phe-L-Phe p-meth
oxy-carbonylphenyl ester was maximized (k(S)DL/k(S)LL = 34) at the opt
imum temperature (30-degrees-C). This could be attributed to the confo
rmational change in the DL isomer, which was supported by the circular
dichroism measurements.