Abstract: An agent for the treatment of allergic eye disease containing a 3-anilino-2-cycloalkenone derivative having the formula (I): wherein R1 is an unsubstituted or substituted C1 to C8 alkyl group provided that an unsubstituted methyl group is excluded, a C3 to C7 cycloalkyl group, a C6 to C10 bicycloalkyl group or an indanyl group, etc., R2 is a C1 to C4 alkyl group, R3 is a hydrogen atom, a C1 to C5 alkyl group, a C3 to C7 cycloalkyl group, etc., R4 is a hydrogen atom, an unsubstituted or substituted C1 to C5 alkyl group, a halogen atom, etc., R5, R6, R7 and R8 are independently a hydrogen atom, a C1 to C5 alkyl group, etc., X is —(CR11R12)n— or NR13—, wherein n is 0 to 2, R11, R12 and R13 are independently a hydrogen atom, a C1 to C5 alkyl group, etc.

Abstract: An agent for the treatment of allergic eye disease containing a 3-anilino-2-cycloalkenone derivative having the formula (I): wherein R1 is an unsubstituted or substituted C1 to C8 alkyl group provided that an unsubstituted methyl group is excluded, a C3 to C7 cycloalkyl group, a C6 to C10 bicycloalkyl group or an indanyl group, etc., R2 is a C1 to C4 alkyl group, R3 is a hydrogen atom, a C1 to C5 alkyl group, a C3 to C7 cycloalkyl group, etc., R4 is a hydrogen atom, an unsubstituted or substituted C1 to C5 alkyl group, a halogen atom, etc., R5, R6, R7 and R8 are independently a hydrogen atom, a C1 to C5 alkyl group, etc., X is —(CR11R12)n— or NR13—, wherein n is 0 to 2, R11, R12 and R13 are independently a hydrogen atom, a C1 to C5 alkyl group, etc.

Abstract: (?)-3-[3-[(1R,2R,4S)-bicyclo[2.2.1]hept-2-yloxy]-4-methoxyanilino]-2-methyl-2-cyclopenten-1-one, or its hydrate or solvate, or a pharmaceutical composition containing the same.

Abstract: An agent for the treatment of allergic eye disease containing a 3-anilino-2-cycloalkenone derivative having the formula (I): 1

Abstract: (−)-3-[3-[(1R, 2R, 4S)-bicyclo[2.2.1]hept-2-yloxy]-4-methoxyanilino]-2-methyl-2-cyclopenten-1-one, or its hydrate or solvate, or a pharmaceutical composition containing the same.

Abstract: A 3-anilino-2-cycloalkenone derivative of the formula (I): wherein, R1 represents a C1 to C8 alkyl group, which may have a substituent, except for a methyl group, a C3 to C7 cycloalkyl group, a 3-tetrahydrofuryl group, an 2-indanyl group, etc., R2 represents a C1 to C4 alkyl group, R3 represents a hydrogen atom, a C3 to C7 alkyl group, which may have a substituent, a C3 to C7 cycloalkyl group, etc., R4 represents a hydrogen atom, a C1 to C5 alkyl group, which may have a substituent, a halogen atom, etc., R5, R6, R7, and R8 independently represent a hydrogen atom, a C1 to C5 alkyl group, which may have a substituent, etc., X represents —(CR11R12)n—, wherein n is 0 to 2, R11 and R12 independently represent a hydrogen atom, a C1 to C5 alkyl group, which may have a substituent, etc.