A compound of Formula III or Formula IV; Formula III Formula IV in which Y is CH2 or C (O); R1, R2, R3, and R4, are each independently, H, C1-C6 alkyl, or an optionally substituted moiety selected from the group consisting of C1-C18 arylalkyl, C2-C18 alkenyl, C1-C18 aliphatic acyl, and arylacil; R5 and R6 are each independently, H or CH3; R9 and R10 are each independently selected from the group consisting of H, C1-C6 alkyl, and C3-C6 cycloalkyl; Ar is an optionally substituted moiety selected from the group consisting of aryl and heterocycle; n is 0 or an integer between 1 and 4; wherein each optionally substituted moiety is optionally substituted by one or more substituents independently selected from the group consisting of aryl, heterocycle, halogen, OR9, NR9R10, CN, NO2, CF3, or C1-C6 alkyl, said optionally substituted C1-C6 alkyl with C1-C4 alkoxy, NR9R10, C3-C6 cycloalkyl, or OH; or one of its pharmaceutically acceptable salts, with the proviso that the compound is not the
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