Patent ID: 7569730

Claim:
A compound represented by the following general formula (I): wherein R 1 represents a hydrogen atom or an alkyl group, R 2 represents a hydroxyalkyl group or a triarylmethyloxyalkyl group, or R 1 and R 2 combine together to represent —C(R 3 )(R 4 )—, wherein R 3 and R 4 independently represent a hydrogen atom, an alkyl group, or a hydroxyl group, or R 3 and R 4 may combine together to represent an oxo group, or R 1 and R 2 combine together to represent —C(R 5 )(R 6 )—O—C(R 7 )(R 8 )—, wherein R 5 , R 6 , R 7 and R 8 independently represent a hydrogen atom, an alkyl group, or a hydroxyl group, or R 5 and R 6 may combine together to represent an oxo group, and/or R 7 and R 8 may combine together to represent an oxo group; and wherein Ar 1 , Ar 2 , Ar 3 Ar 4 independently represent aryl group, which may have 1 to 5 of the same or different substituents, and wherein *1, *2, *3 and *4 indicate asymmetric carbons, and relative steric configurations thereof are in cis-configuration between *1 and *2, cis-configuration between *3 and *4, and trans-configuration between *2 and *3.