CPC C07D 209/16 (2013.01) [C07B 2200/05 (2013.01); C07B 2200/13 (2013.01)] | 19 Claims |
1. A crystalline fumarate salt of a compound having a Formula I :
wherein:
each R1 is independently selected from protium and deuterium;
each R2 is independently selected from protium and deuterium;
each R3 is independently selected from protium and deuterium; and
each R4 is independently selected from protium and deuterium; and
wherein the crystalline fumarate salt has a PXRD pattern comprising characteristic peaks at 19.2±0.2 and 24.7±0.2 degrees 2-theta.
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