Patent ID: 8889688

Claim:
A compound of the formula I: wherein X is CH or N; R 1 represents —NO 2 , —N(CH 3 ) 2 , or —NCH 3 (CH 2 CH 2 OH); and R 2 represents hydrogen, methyl, ethyl, n-propyl, isopropyl, tert-butyl, cyano, halogen, methoxy, ethoxy, n-propoxy, isopropoxy, trifluoromethyl, difluoromethoxy, methylsulfonyl, acetyl, or acetylamino; or X is CH, R 1 is hydrogen, and R 2 is ethyl, isopropyl, tert-butyl, ethoxy, n-propoxy, isopropoxy, methylsulfonyl, acetylamino, or methoxycarbonyl; or X is CH, R 1 is cyano, and R 2 is ethyl, isopropyl, tert-butyl, ethoxy, n-propoxy, isopropoxy, trifluoromethyl, difluoromethoxy, trifluoromethoxy, methylsulfonyl, or acetylamino; or X is CH, R 1 is chloro, and R 2 is ethyl, isopropyl, tert-butyl, ethoxy, n-propoxy, isopropoxy, difluoromethoxy, methylsulfonyl, or acetylamino; or X is CH, R 1 is methoxy or isopropoxy, and R 2 is trifluoromethyl; or X is CH, R 1 is methylsulfonyl or ethylsulfonyl, and R 2 is trifluoromethyl, ethyl, isopropyl, tert-butyl, ethoxy, n-propoxy, isopropoxy, or difluoromethoxy; or a salt of such a compound.