Patent ID: 7220744

Claim:
A compound of formula I wherein R 1 is —OR 1′ , —SR 1′ , or morpholino; R 1′ is lower alkyl, lower alkyl substituted by halogen, or —(CH 2 ) n -cycloalkyl; R 2 is —S(O) 2 -lower alkyl, —S(O) 2 NH-lower alkyl, NO 2 , or CN; X 1 is CR 3 or N; X 2 is CR 3′ or N; R 3 and R 3′ are each independently hydrogen, halogen, lower alkyl, CN, NO 2 , —S(O) 2 -phenyl, —S(O) 2 -lower alkyl, —S(O) 2 -pyridin-2, 3 or 4-yl, phenyl optionally substituted by one or two substituents selected from the group consisting of NO 2 and halogen, lower alkyl substituted by halogen, or —C(O)-lower alkyl; n is 0, 1, or 2; or a pharmaceutically acceptable acid addition salt thereof.