Solid forms of a toll-like receptor modulator

A crystalline form of Compound I having the structure:

• characterized by an X-ray powder diffraction (XRPD) pattern comprising three or more peaks at 5.5, 9.4, 10.8, 11.9, 12.9, 14.4, 16.0, 19.0, 21.9, or 23.9 degrees 2θ (±0.2 degrees 2θ), wherein the XRPD is made using CuKα1 radiation.

A pharmaceutical composition comprising a crystalline form of Compound I having the structure:

• characterized by an X-ray powder diffraction (XRPD) pattern comprising three or more peaks at 5.5, 9.4, 10.8, 11.9, 12.9, 14.4, 16.0, 19.0, 21.9, or 23.9 degrees 2θ (±0.2 degrees 2θ), wherein the XRPD is made using CuKα1 radiation, and a pharmaceutically acceptable carrier or excipient.

A method of preparing a crystalline form of Compound I having the structure:

• characterized by an X-ray powder diffraction (XRPD) pattern comprising three or more peaks at 5.5, 9.4, 10.8, 11.9, 12.9, 14.4, 16.0, 19.0, 21.9, or 23.9 degrees 2θ (±0.2 degrees 2θ), wherein the XRPD is made using CuKα1 radiation,
• the method comprising forming a mixture comprising crystalline Form I of Compound I and chloroform under conditions suitable to prepare the crystalline form of Compound I.