tert-butyl 5-bromo-8-methoxy-3-methyl-7-[methyl-[(2-methylpropan-2-yl)oxycarbonyl]amino]pyrido[2,3-b]indole-9-carboxylate;tert-butyl 5-(3-ethylsulfonylphenyl)-8-methoxy-3-methyl-7-[methyl-[(2-methylpropan-2-yl)oxycarbonyl]amino]pyrido[2,3-b]indole-9-carboxylate;(3-ethylsulfonylphenyl)boronic acid;5-(3-ethylsulfonylphenyl)-8-methoxy-N,3-dimethyl-9H-pyrido[2,3-b]indol-7-amine;N-[5-(3-ethylsulfonylphenyl)-8-methoxy-3-methyl-9H-pyrido[2,3-b]indol-7-yl]-N-methylcyclopropanecarboxamide