Patent ID: 8236971

Claim:
A polycyclic ester comprising a cyano group and a lactone skeleton, represented by following Formula (1): wherein R a represents a hydrogen atom, a halogen atom, or an alkyl group having one to six carbon atoms which may have a halogen atom; R 1 s are substituents bound to a ring and each represent a halogen atom, or an alkyl or haloalkyl group having one to six carbon atoms; “A” represents nonbonding or a methylene group; “m” is the number of R 1 s and represents an integer of 0 to 3; “n” is the number of cyano groups (CN) bound to the ring and represents an integer of 1; and CH 2 ═C(R a )COO— group may have either of an endo conformation and an exo conformation; wherein when “A” represents nonbonding, a cyano group is bound at the 1-position or the 2-position in the 6-oxabicyclo[3.2.1 1,5 ]octane ring; and wherein when “A” represents a methylene group, a cyano group is bound at the 1-position or the 9-position in the 3-oxatricyclo[4.2.1.0 4,8 ]nonane ring.