Patent ID: 8524745

Claim:
A compound represented by Formula I, its enantiomers, diastereoisomers or a pharmaceutically acceptable salt thereof, wherein: R 1 is substituted or unsubstituted C 1-10 alkyl, substituted or unsubstituted heterocycle, substituted or unsubstituted C 3-10 cycloalkyl, substituted or unsubstituted C 3-10 cycloalkenyl or substituted or unsubstituted C 6-10 aryl; R 2 is substituted or unsubstituted C 1-6 alkyl; R 3 is H, substituted or unsubstituted C 1-6 alkyl, halogen, substituted or unsubstituted —OC 1-3 alkyl, CN, NO 2 , C 2-6 alkenyl, C 2-6 alkynyl, C(O)R 6 , NR 7 R 8 or hydroxyl; R 4 is H, substituted or unsubstituted C 1-6 alkyl, halogen, substituted or unsubstituted —OC 1-3 alkyl, CN, NO 2 , C 2-6 alkenyl, C 2-6 alkynyl, C(O)R 6 , NR 7 R 8 or hydroxyl; R 5 is H, substituted or unsubstituted C 1-6 alkyl, halogen, substituted or unsubstituted —OC 1-3 alkyl, CN, NO 2 , C 2-6 alkenyl, C 2-6 alkynyl, C(O)R 6 , NR 7 R 8 or hydroxyl; X is O, S or NH; R 6 is H or substituted or unsubstituted C 1-6 alkyl; R 7 is H or substituted or unsubstituted C 1-6 alkyl; R 8 is H or substituted or unsubstituted C 1-6 alkyl; with the proviso that the compound of Formula I does not have one of the following structures: