1 548 6-chloro-3,4-dimethyl-1-(3-methylpyridin-4-yl)-8-(trifluoromethyl)imidazo[1,5-a]quinoxaline 1.000 2 540 8-fluoro-6-methoxy-3,4-dimethyl-1-(3-methylpyridin-4-yl)imidazo[1,5-a]quinoxaline 0.733