The invention relates to the novel materials of formula (I), where: R1 is an optionally substituted L-aryl or –L-heteroaryl, such that L is a single bond, alkyl, CO, or CO-alk, or L'-X, with L' being an alkyl and X being O or S; R2 is H or alkyl; R3 is an alkyl optionally substituted by Hal; and R4 is Hou Hal, wherein said materials are in any isomeric form and the salts thereof, to be used as drugs.


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