Solid forms of N-[2,4-bis(1,1-dimethylethyl)-5-hydroxyphenyl]-1,4-dihydro-4-oxoquinoline-3-carboxamide

1. Crystalline N-[2,4-bis(1,1-dimethylethyl)-5-hydroxyphenyl]-1,4-dihydro-4-oxoquinoline-3-carboxamide (Compound 1) characterized as Form C, wherein Form C is characterized by a peak at about 152.0 ppm in a 13 C SSNMR spectrum, and wherein the Form C is isolated and purified.

2. Form C according to claim 1 , characterized by a peak at about 135.4 ppm in a 13 C SSNMR spectrum.

3. Form C according to claim 2 , characterized by a peak at about 131.8 ppm in a 13 C SSNMR spectrum.

4. Form C according to claim 3 , characterized by a peak at about 117.0 ppm in a 13 C SSNMR spectrum.

5. Form C according to claim 4 , characterized by a peak at about 130.2 ppm in a 13 C SSNMR spectrum.

6. Form C according to claim 5 , characterized by a peak at about 124.8 ppm in a 13 C SSNMR spectrum.

7. Form C according to claim 6 , characterized by a peak at about 34.5 ppm in a 13 C SSNMR spectrum.

8. Form C according to claim 1 , characterized by one or more peaks in a 13 C SSNMR spectrum selected from about 152.0 ppm, about 135.4 ppm, about 131.8 ppm, about 130.2, about 124.8 ppm, about 117.0 ppm and about 34.5 ppm.

9. Form C according to claim 1 , characterized by a peak at about 152.0 ppm, a peak at about 135.4 ppm, a peak at about 131.8 ppm and a peak at about 117.0 ppm in a 13 C SSNMR spectrum.

10. Form C according to claim 9 , further characterized by a peak at about 130.2 ppm, a peak at about 124.8 ppm and a peak at about 34.5 ppm in a 13 C SSNMR spectrum.

11. Form C according to claim 1 , wherein Form C is characterized by a single crystal which is determined to possess a monoclinic crystal system, a P2 1 /c space group, and the following unit cell dimensions:

a=12.211 Angstroms;

b=5.961 Angstroms;

c=32.662 Angstroms;

α=90.00°;

β=119.62°; and

γ=90.00°.

12. Form C according to claim 1 , wherein Form C is characterized by a peak at about 6.2, a peak at about 7.5, a peak at about 8.3, a peak at about 12.4, a peak at about 14.6, a peak at about 17.9, a peak at about 20.5 and a peak at about 20.9 degrees as measured on a 2-Theta scale in an XRPD diffraction pattern.

13. A pharmaceutical composition comprising Form C according to claim 1 , 11 , or 12 , and a pharmaceutically acceptable adjuvant or carrier.

14. A pharmaceutical composition according to claim 13 , further comprising an additional agent selected from a mucolytic agent, bronchodilator, an antibiotic, an anti-infective agent, an anti-inflammatory agent, a CFTR modulator other than Form C, or a nutritional agent.

15. A pharmaceutical composition according to claim 14 , wherein the additional agent is a CFTR modulator other than Form C.