A compound of Formula (I) ** Formula ** in which ring A represents a benzene, pyridine, or pyrimidine ring； (R1) n represents one or two optional substituents each independently selected from the group consisting of (C1-4) alkyl； (C1-4) alkoxy； fluoroalkyl (C1-3)； fluoroalkoxy (C1-3)； halogen； cyano； (C3-6) cycloalkyl optionally mono-substituted with hydroxy； (C1-3) alkoxy-(C1-4) alkyl； (C1-3) alkoxy-(C2-4) alkoxy； hydroxy (C1-4) alkyl； hydroxy-C2-4 alkoxy； hydroxy； (C1-4) alkyl sulfonyl； phenyl； 5-membered heteroaryl optionally substituted with (C1-4) alkyl； -CO-C 1-4 alkyl； -CO-C1-4 alkoxy； - (CH2) q-NR6R7, wherein R6 and R7 independently represent hydrogen or (C1-4) alkyl； and q represents the integer 0, 1, or 2； and -L-heterocyclyl, in which -L- represents -O- or - (CH2) r- in which r represents the integer 0, 1, or 2； and the heterocyclyl is independently a 4- to 7-membered monocyclic saturated ring containing one or two heteroatoms independently selected from nitrogen and oxygen, wherein said heterocyclyl is optionally substituted with a substituent independently selected from (C1-4) alkyl, alkoxy ( C1-4), and oxo； R2 represents hydrogen, (C1-4) alkyl, or (C1-3) alkoxy-(C2-4) alkyl； R4 represents hydrogen； and R4 'represents methyl； wherein the carbon atom to which R4 'is attached is in the absolute configuration (R)； and R5 represents · aryl, wherein said aryl is unsubstituted, or mono-, di-, or tri-substituted, in which the substituents are independently selected from the group consisting of (C1-4) alkyl； (C1-4) alkoxy； fluoroalkyl (C1-3)； fluoroalkoxy (C1-3)； halogen； cyano； (C1-3) alkoxy-(C1-4) alkyl； (C1-3) alkoxy-(C2-4) alkoxy； hydroxy； hydroxy (C1-4) alkyl； 5-membered heteroaryl； and heterocyclyl, wherein the heterocyclyl is a 5 to 7 membered monocyclic saturated ring containing one or two nitrogen atoms, wherein said heterocyclyl is optionally substituted on a nitrogen having a free valence with (C1-4) alkyl ； or · 5 or 6 membered heteroaryl, wherein s
