D-tartrate crystalline methyl ester of (1- {3- [6- (9,9-difluoro-7- {2- [5- (2-methoxycarbonylamino-3-methylbutyryl) -5-aza-spiro [2.4] ] hept-6-yl] -3H-imidazol-4-yl} -9H-fluorene-2-yl) -1H-benzoimidazol-2-yl] -2-azabicyclo [2.2.1] heptane-2-carbonyl} - 2-methyl-propyl) -carbamic acid (D-tartrate of Compound I), characterized by a powder X-ray diffractogram comprising the following peaks: 4.0, 10.3 and 19.7 ° 2θ + 0.2 ° 2θ, as determined in a diffractometer using Cu-Kα radiation at a wavelength of 1.54178 Å.
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