Crystalline forms of 1-benzoyl-4-[2-[4-methoxy-7-(3-methyl-1H-1,2,4-triazol-1-yl)-1-[(phosphonooxy)methyl]-1H-pyrrolo[2,3-c]pyridin-3-yl]-1,2-dioxoethyl]-piperazine its salts and solvates thereof are herein set forth, as are pharmaceutical compositions comprising the crystalline form(s), as well of methods of using the crystalline form(s) in the treatment of HIV and/or AIDS, and methods for obtaining such crystalline form(s).