SOLID FORMS OF 2-(3,5-DICHLORO-4-((5-ISOPROPYL-6-OXO-1,6-DIHYDROPYRIDAZIN-3-YL)OXY)PHENYL)-3,5-DIOXO-2,3,4,5-TETRAHYDRO-1,2,4-TRIAZINE-6-CARBONITRILE

1 . A morphic Form λ of 2-(3,5-dichloro-4-((5-isopropyl-6-oxo-1,6-dihydropyridazin-3-yl)oxy)phenyl)-3,5-dioxo-2,3,4,5-tetrahydro-1,2,4-triazine-6-carbonitrile.

2 . The morphic form of claim 1 , characterized by an X-ray powder diffraction pattern including peaks at about 10.6, about 12.0, about 14.3, about 16.2, about 17.6, about 18.0, and about 24.3 degrees 2θ, wherein the x-ray powder diffraction pattern is obtained using a CuKα radiation source (1.54 Å).

3 . The morphic form of claim 2 , further characterized by an X-ray powder diffraction pattern including one or more additional peaks at about 11.2, about 15.6, about 17.3, and about 22.3 degrees 2θ, wherein the x-ray powder diffraction pattern is obtained using a CuKα radiation source (1.54 Å).

4 . The morphic form of claim 1 , having an X-ray diffraction pattern substantially similar to that set forth in FIG. 27 .

5 . The morphic form of claim 1 , wherein the morphic form has a purity of greater than 90% by weight.

6 . The morphic form of claim 1 , wherein the morphic form has a purity of greater than 95% by weight.

7 . The morphic form of claim 1 , wherein the morphic form has a purity of greater than 99% by weight.

8 . A pharmaceutical composition comprising the morphic form of claim 1 .

9 . The pharmaceutical composition of claim 8 , further comprising at least one pharmaceutically acceptable excipient or carrier.

10 . The pharmaceutical composition of claim 8 , wherein the pharmaceutical composition is a tablet.

11 . A morphic Form F of 2-(3,5-dichloro-4-((5-isopropyl-6-oxo-1,6-dihydropyridazin-3-yl)oxy)phenyl)-3,5-dioxo-2,3,4,5-tetrahydro-1,2,4-triazine-6-carbonitrile.

12 . The morphic form of claim 11 , characterized by an X-ray powder diffraction pattern including peaks at about 10.1, about 10.4, about 11.4, about 13.9, about 16.2, about 16.4, about 17.1, about 22.0 about 23.8, and about 29.5 degrees 2θ, wherein the x-ray powder diffraction pattern is obtained using a Cu Kα radiation source (1.54 Å).

13 . The morphic form of claim 12 , further characterized by an X-ray powder diffraction pattern including one or more additional peaks at about 18.4, about 19.3, about 22.5, and about 28.0 degrees 2θ, wherein the x-ray powder diffraction pattern is obtained using a CuKα radiation source (1.54 Å).15.

14 . The morphic form of claim 11 , having an X-ray diffraction pattern substantially similar to that set forth in FIG. 6 .

15 . The morphic form of claim 11 , wherein the morphic form has a purity of greater than 90% by weight.

16 . The morphic form of claim 11 , wherein the morphic form has a purity of greater than 95% by weight.

17 . The morphic form of claim 11 , wherein the morphic form has a purity of greater than 99% by weight.

18 . A pharmaceutical composition comprising the morphic form of claim 11 .

19 . The pharmaceutical composition of claim 18 , further comprising at least one pharmaceutically acceptable excipient or carrier.

20 . The pharmaceutical composition of claim 18 , wherein the pharmaceutical composition is a tablet.

21 . A morphic Form L of 2-(3,5-dichloro-4-((5-isopropyl-6-oxo-1,6-dihydropyridazin-3-yl)oxy)phenyl)-3,5-dioxo-2,3,4,5-tetrahydro-1,2,4-triazine-6-carbonitrile.

22 . The morphic form of claim 21 , characterized by an X-ray powder diffraction pattern including peaks at about 10.5, about 11.5, about 11.9, about 15.2, about 15.7, about 16.0, about 16.9, about 17.1, about 18.4, about 18.7, about 22.0, about 22.8, about 23.5, and about 26.4 degrees 2θ, wherein the x-ray powder diffraction pattern is obtained using a Cu Kα radiation source (1.54 Å).

23 . The morphic form of claim 22 , further characterized by an X-ray powder diffraction pattern including one or more additional peaks at about 8.1, about 12.3, about 24.1, and about 24.7 degrees 2θ, wherein the x-ray powder diffraction pattern is obtained using a CuKα radiation source (1.54 Å).26.

24 . The morphic form of claim 21 , having an X-ray diffraction pattern substantially similar to that set forth in FIG. 11 .

25 . The morphic form of claim 21 , wherein the morphic form has a purity of greater than 90% by weight.

26 . The morphic form of claim 21 , wherein the morphic form has a purity of greater than 95% by weight.

27 . The morphic form of claim 21 , wherein the morphic form has a purity of greater than 99% by weight.

28 . A pharmaceutical composition comprising the morphic form of claim 21 .

29 . The pharmaceutical composition of claim 28 , further comprising at least one pharmaceutically acceptable excipient or carrier.

30 . The pharmaceutical composition of claim 28 , wherein the pharmaceutical composition is a tablet.