(R)-5-chloro-3-(2-chloro-5-fluoro-4-methoxyphenylamino)-1-(1-cyclopropylethyl)pyrazin-2(1H)-one
(R)-5-chloro-1-(1-cyclopropylethyl)-3-(2,4,6-trichlorophenylamino)pyrazin-2(1H)-one
(R)-5-chloro-3-(4-chloro-2-methoxy-5-methylphenylamino)-1-(1-cyclopropylethyl)pyrazin-2(1H)-one
(R)-3-chloro-4-[6-chloro-4-(1-cyclopropylethyl)-3-oxo-3,4-dihydropyrazin-2-ylamino]-5-methylbenzonitrile
(R)-5-chloro-1-(1-cyclopropylethyl)-3-(2,6-dichloro-4 (methylsulfonyl)phenylamino)pyrazin-2(1H)-one