Patent ID: 8546568

Claim:
A compound represented by general formula (I) below: wherein: R1 is (a) hydrogen, (b) hydroxy, (c) an alkyl having 1 to 4 carbon atoms which may optionally be substituted with an alicyclic group, or (d) trifluoromethyl; R2 is (a) hydrogen, (b) hydroxy, (c) a halogen, (d), an alkyl having 1 to 4 carbon atoms which may optionally be substituted with an alicyclic group, (e) trifluoromethyl, or (f) an alkoxyl; R3 is (a) hydrogen, (b) an alkyl having 1 to 4 carbon atoms which may optionally be substituted with an alicyclic group, or (c) an alkoxyl; R4 is a substituted or unsubstituted benzyl; R5 is hydrogen or a substituted or unsubstituted alkyl; X1 is hydrogen or hydroxy; and, X2 is hydrogen or hydroxy; with the proviso that when R2 and R3 are hydrogen, R1 is (a) an alkyl having 1 to 4 carbon atoms which may optionally be substituted with an alicyclic group or (b) trifluoromethyl, when R1 and R3 are hydrogen, R2 is (a) hydroxy, (b) an alkyl having 1 to 4 carbon atoms which may optionally be substituted with an alicyclic group, (c) trifluoromethyl, or (d) an alkoxyl, and, when R1 and R2 are hydrogen, R3 is (a) an alkyl having 1 to 4 carbon atoms which may optionally be substituted with an alicyclic group or (b) an alkoxyl.