Reply to the ‘Comment on “Trimorphs of a pharmaceutical cocrystal involving two active pharmaceutical ingredients: potential relevance to combination drugs” by S. Aitipamula, P. S. Chow and R. B. H. Tan, CrystEngComm, 2009, 11, 1823’†
Abstract
The inadvertent errors in the lattice energy calculations of the polymorphs reported in our previous article (CrystEngComm, 2009, 11, 1823–1827) were rectified. Form I (Refcode: QULLUF) was found to be the most thermodynamically stable polymorph by slurry experiments even though it has marginally higher lattice energy than the other two polymorphs.