Patent ID: 6894055

Claim:
A compound of formula 1: wherein X is O, or NR 11 (where R 11 is H or lower alkyl); R 1 is lower alkyl, aryl, or aralkyl; R 2 is methylthio, H, lower alkyl, aryl, aralkyl, heteroaryl, heteroaryl-alkyl, lower alkoxy, amino, lower alkylamino, lower acylamino, arylamino, arylacyl-amino, heteroaryl-amino, heteroaryl-acyl amino, thio, lower alkylthio, arylthio, or aralkyl-thio, where aryl and heteroaryl are substituted with 0-3 substituents selected from the group consisting of halo, trihalomethyl, hydroxy, lower alkyl and lower alkoxy; R 3 , R 4 , R 5 , R 6 R 7 , and R 8 are each independently H, lower alkyl, lower alkoxy, or halo; and pharmaceutically acceptable salts thereof.