Cyclic compounds

A compound represented by the formula:

• A-W—Ar (I)
• wherein, A is a group represented by the formula:
• wherein R1a is
• (1) an amino which is mono- or di-substituted with
• (i) a C1-8 alkyl which may be substituted with a hydroxyl substituted with a C1-8 alkyl,
• a C3-7 cycloalkyl, a phenyl, a 4-methylphenyl, a hydroxyl substituted with a phenyl,
• a 2-chlorophenyl, a heterocyclic group, a 4-chlorophenyl, a 4-(benzyloxy)phenyl,
• a 3-methoxyphenyl, a 3-chlorophenyl, a 2′-cyanobiphenyl, a naphthyl, a 2,5-dimethoxyphenyl,
• a 3-fluoro-5-(trifluoromethyl)phenyl, an acyl, or an esterified or amidated carboxyl,
• (ii) a C2-8 alkenyl,
• (iii) a C1-10 acyl, or
• (iv) a C3-7 cycloalkyl, or
• (2) a cyclic amino;
• R2 is a hydrogen, a C1-8 alkyl which may be substituted by a cyano or a phenyl;
• R2′ is
• (1) a hydrogen,
• (2) an acetyl, or
• (3) a C1-8 alkyl which may be substituted with a phenyl, a 4-methoxyphenyl or an acetyl;
• W is a bond;
• and
• Ar is a phenyl which is substituted with
• (i) one or more C1-8 alkyl which may be substituted with one or more halogen,
• (ii) one or more alkoxy,
• (iii) one or more halogen,
• (iv) one or more benzyloxy, or
• (v) one or more hydroxy;
• or a salt thereof.