Patent ID: 8293436

Claim:
A compound represented by the following formula (I): wherein, in formula (I), R 1′ represents a substituent containing an aromatic ring; R 1a represents an alkyl group having a substituent —SAr wherein Ar represents an aromatic ring or heteroaromatic ring which may have a substituent; R 2a represents an alkanoyl group, an alkenoyl group, an aryloyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a heterocyclic oxycarbonyl group, a heteroaryloxycarbonyl group, an alkylthiocarbonyl group, an arylthiocarbonyl group, a heterocyclic thiocarbonyl group, a heteroarylthiocarbonyl group, or —CO—CO-Rd wherein Rd represents an aromatic or heteroaromatic group which may have a substituent; and n represents an integer of 1.