(R)-4-(7-cyano-6-ethyl-5-isopropyl-5,6-dihydroimidazo[1,5-f]pteridin-3-ylamino)-3-methoxybenzoic acid
(R)-4-(7-cyano-6-ethyl-5-isopropyl-5,6-dihydroimidazo[1,5-f]pteridin-3-ylamino)-2-fluoro-5-methoxybenzoic acid
(R)-4-(7-cyano-5-cyclopentyl-6-ethyl-5,6-dihydroimidazo[1,5-f]pteridin-3-ylamino)-2-fluoro-5-methoxybenzoic acid
(R)-3-(7-cyano-6-ethyl-5-isopropyl-5,6-dihydroimidazo[1,5-f]pteridin-3-ylamino)-4-methoxybenzoic acid