2-Pyridinesulfonamide, N-[3-[(1S)-1-[(6S)-5,6-dihydro-4-hydroxy-2-oxo-6-(2-phenylethyl)-6-propyl-2H-pyran-3-yl]propyl]phenyl]-5-(trifluoromethyl)- AIDS-007997 AIDS007997 Tipranavir enantiomer U-141275