N-((4,6-dimethyl-2-oxo-1,2-dihydropyridin-3-yl)methyl)-5-(ethyl(tetrahydro-2H-pyran-4-yl)amino)-4- Methyl-4''-(morpholinomethyl)-[1,1''-biphenyl]-3-carboxamide hydrobromide is provided herein. In addition, certain polymorphs of this compound are also provided herein.N-((4,6-디메틸-2-옥소-1,2-디히드로피리딘-3-일)메틸)-5-(에틸(테트라히드로-2H-피란-4-일)아미노)-4-메틸-4'-(모르폴리노메틸)-[1,1'-비페닐]-3-카르복사미드 히드로브로마이드가 본원에 제공된다. 또한, 이 화합물의 특정 다형체도 본원에 제공된다.