Patent ID: 8076339

Claim:
A compound of the formula I or pharmaceutically acceptable salt: wherein: X is CH; Y is O or S; W is C or N; R 1 , R 2 , R 3 each independently is hydrogen or halogen; R 4 , R 5 , R 6 each independently is hydrogen, halogen, C l ˜C 8 straight or branched alkyl, C 1 ˜C 8 straight or branched alkoxy, nitro, cyano, —COOR 7 , —CH 2 —O—R 8 , —CH 2 COOR 7 , —COR 7 ; each R 7 independently is hydrogen or C 1 ˜C 8 straight or branched alkyl; and R 8 is hydrogen or cyano.