Patent ID: 8642786

Claim:
A dihydrothiophene compound represented by the formula (6): wherein: R 1 represents a C 6-10 aryl group or a C 1-5 heteroaryl group, unsubstituted or substituted with one or more halogen atoms, one or more carboxy groups, one or more nitro groups, one or more formyl groups, one or more cyano groups, one or more hydroxy groups, one or more protected hydroxy groups, one or more thiol groups, one or more amino groups, one or more C 1-10 alkyl groups, one or more C 2-6 alkenyl groups, one or more C 2-6 alkynyl groups, one or more C 1-10 alkoxy groups, one or more C 1-10 alkylcarbonyl groups, one or more C 1-10 alkylcarbonyloxy groups, one or more C 1-10 alkoxycarbonyl groups or one or more C 6-10 aryl groups, such that the C 1-10 alkyl groups, the C 2-6 alkenyl groups, the C 2-6 alkynyl groups, the C 1-10 alkoxy groups, the C 1-10 alkylcarbonyl groups, the C 1-10 alkylcarbonyloxy groups, the C 1-10 alkoxycarbonyl groups and the C 6-10 aryl groups are unsubstituted or substituted with one or more halogen atoms; R 2 and R 3 independent represent a hydrogen atom, a C 1-6 alkyl group or a C 6-10 aryl group, unsubstituted or substituted with one or more halogen atoms, one or more nitro groups, one or more cyano groups, one or more hydroxy groups, one or more protected hydroxy groups, one or more thiol groups, one or more amino groups, one or more C 1-10 alkyl groups, one or more C 2-6 alkenyl groups, one or more C 2-6 alkynyl groups, one or more C 1-10 alkoxy groups or one or more C 6-10 aryl groups, such that the C 1-10 alkyl groups, the C 2-6 alkenyl groups, the C 2-6 alkynyl groups, the C 1-10 alkoxy groups and the C 6-10 aryl groups are unsubstituted or substituted with one or more halogen atoms.