CPC C07D 401/14 (2013.01) [C07B 2200/13 (2013.01)] | 12 Claims |
1. A crystalline form A of a compound of formula (I):
which is a free base of the compound of formula (I), characterized by an X-ray powder diffraction (XRPD) pattern comprising peaks at 10.979, 19.26, 21.581 and 24.801 degrees 2θ.
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