Patent ID: 7718809

Claim:
A compound of the formula (I): wherein: -A-B— is —O—CH 2 —, —S—CH 2 —, —CH 2 —O—, or —CH 2 —S—; X is an oxygen atom or NH; R 1 and R 2 are each independently C 1 -C 4 alkyl each being unsubstituted or substituted with 1 to 2 substituents independently selected from hydroxy or C 1 -C 4 alkoxy; R 3 and R 4 are each independently hydrogen, C 1 -C 4 alkyl, or C 3 -C 7 cycloalkyl, said C 1 -C 4 alkyl and said C 3 -C 7 cycloalkyl being unsubstituted or substituted with 1 to 3 substituents independently selected from halogen, hydroxy, C 1 -C 4 alkoxy, or C 3 -C 7 cycloalkyl; or R 3 and R 4 taken together with the nitrogen atom to which they are attached form a 4 to 6 membered heterocyclic group being unsubstituted or substituted with 1 to 3 substituents selected from hydroxy, C 1 -C 4 alkyl, C 1 -C 4 acyl, or hydroxy-C 1 -C 4 alkyl; R 5 , R 6 , R 7 , and R 8 are each independently hydrogen, halogen, hydroxy, C 1 -C 4 alkyl, or C 1 -C 4 alkoxy; and R 9 is hydrogen, hydroxy, or C 1 -C 4 alkoxy; or a pharmaceutically acceptable salt thereof.