Abstract

The crystal structure of the potassium salt of raltegravir has been solved and refined using synchrotron X-ray powder diffraction data, and optimized using density functional techniques. Raltegravir potassium crystallizes in space groupP21/c(#14) witha= 15.610 59(9),b= 8.148 19(3),c= 16.125 97(6) Å,β= 94.1848(5)°,V= 2045.72(1) Å3, andZ= 4. The most prominent feature of the crystal structure is the chains of edge-sharing 7-coordinate KO5N2parallel to theb-axis. The crystal structure can be described as having K-containing layers in thebc-plane, with double layers of CH4F halfway between them. The raltegravir anion is not in the minimum-energy conformation, suggesting that coordination to the K and hydrogen bonds play a significant role in the solid-state structure. The powder pattern is included in the Powder Diffraction File™ as entry 00-064-1499.

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