A frequency divider has two or more storage elements connected in a loop. That is, the present invention provides a one-handed helical poly compound represented by the following formula wherein each symbol is as described in the DESCRIPTION, and a production method thereof, an optical isomer separating agent containing the poly compound, and a packing material for a chiral column, containing the optical isomer separating agent coated on a carrier. The SHG waves are detected by a SHG detector.