The subject invention features compounds having the structure: wherein X is O, S, CH2 or NR5; Y is O or S; R1 is H, substituted or unsubstituted C1-C15
alkyl, C1-C8 alkylaryl, —C(O)OR4, —C(O)NR4R5, —CR6R6′OR4, —CR6R6′OC(O)R4, —CR6R6′OC(O)NHR7, —C(O)NR10R11, —C(O)NR8R9NR8R9, —N(R5)C(O)NHR5, or CH2R4; R2 is a substituted or unsubstituted,
straight chain C1—C30
alkyl or branched C3-C30
alkyl,
aryl, alkylaryl, arylalkyl, heteroarylalkyl or cycloalkyl; R3 is H or substituted or unsubstituted C1-C6 alkyl or C3-C10 cycloalkyl; R4 is H or a substituted or unsubstituted,
straight chain or branched, C6-C30 alkyl,
aryl, —CH2-
aryl, aryl —C1-C15 alkyl, heteroaryl-C1-C15alkyl or C3-C10 cycloalkyl; R5 is H or a substituted or unsubstituted,
straight chain or branched, C6-C30 alkyl, aryl C1-C30alkyl, heteroarylalkyl or cycloalkyl; R6 and R6′ are each independently H, substituted or unsubstituted C1-C6 alkyl, dialkyl or C3-C10 cycloalkyl or together form a 3-7 membered ring
system; R7 is H or substituted or unsubstituted C1-C12 alkyl or C3-C10 cycloalkyl; R8 and R9 are each independently H, substituted or unsubstituted C1-C6 alkyl, C1-C6 alkoxy, C1-C6 alkylaryl, or NR8R9 together form a substituted
piperazine or
piperidine ring or a dihydro-1H-
isoquinoline ring
system, or a specific
enantiomer thereof, or a specific
tautomer, or a pharmaceutically acceptable salt thereof and a method for treating diabetes or
obesity by administering a therapeutically effective amount of the compounds of the invention.