(1) A compound represented by Formula II, where Z is a single bond and Y is --COO--, can be synthesized by the following method, using the optically active substances represented by Formula V or VI as part of its material. ##STR14## where R1 and R2 are the same or different straight-chain or branched chain alkyl groups having 1 to 15 carbon atoms; X1 is a single bond, --O--, --COO--, or --OCO--; X