Patent ID: 7994357

Claim:
A compound represented by the following formula (I): wherein R 1 is hydrogen, alkyl, alkenyl, C 3-8 cycloalkyl, 5-membered or 6-membered unsaturated carbocycle or 5-membered or 6-membered heterocycle; X is C, O, N or S; Y is O, NH or O—C 1-4 alkyl; n is an integer of 0 to 10; m is an integer of 1 to 5; R 2 and R 3 is independently C 1-6 alkyl; R 4 is C 5-6 cycloalkyl or 5-membered or 6-membered unsaturated carbocycle or heterocycle which may be substituted with halogen, CF 3 , OR 7 or NR 7 R 8 , wherein R 7 and R 8 are independently hydrogen or C 1-6 alkyl; R 5 is OH, NH 2 or C 5-6 cycloalkyl, 5-membered or 6-membered unsaturated carbocycle or heterocycle wherein the cycloalkyl, carboycle and heterocycle may be optionally substituted with halogen, NH 2 , NO 2 , C 1-6 alkoxy, C 1-6 alkylthio, OR 7 , NR 7 R 8 or CF 3 ; and R 6 is H, C 1-10 alkyl which may be substituted by hydroxy or C 2-10 alkenyl, or together with R 1 being —C 2 H 2 —; and pharmaceutically acceptable salts, stereoisomers, and enantiomers thereof.