Patent ID: 8871187

Claim:
A compound of formula (I) in which: R1 represents an aryl, a substituted aryl or a cycloalkyl; R2 represents a hydrogen atom, a hydroxyl, a lower alkyl, a substituted lower alkyl, a higher alkyl, a substituted higher alkyl, a cycloalkyl, a cycloalkylalkyl, a lower alkoxy, a substituted lower alkoxy, a higher alkoxy, a substituted higher alkoxy, a cycloalkylalkoxy, or an acyloxy; R3 represents an aralkyl or a substituted aralkyl; R4 represents a heteroaralkyl, a substituted heteroaralkyl, a heteroalkyl or a substituted heteroalkyl; and R5 represents a hydrogen atom, a hydroxyl, an amino, an acylamino or a sulphonamide; or a salt or enantiomer of the compound of formula (I).