US8551987B2 - Crystalline Ethyl 4-[4-[(2r)-3-[4-Amino-3-Chloro-5-(trifluoromethyl)phenyl]-1-Oxo-2-[[[4-(1,2,4,5-Tetrahydro-2-Oxo-3h-1,3-Benzodiazepin-3-Yl)-1-Piperidinyl]carbonyl]oxy]propyl]-1-Piperazinyl]-Piperidine-1-Acetate Difumarate