1. A method of treating HIV in a human in need thereof, the method comprising administering to the human a therapeutically effective amount of a crystalline form of Compound I having the structure:
characterized by an X-ray powder diffraction (XRPD) pattern comprising peaks at 5.8, 11.6, and 22.3 degrees 2θ (±0.2 degrees 2θ), wherein the XRPD is made using CuKα1 radiation.