BIS THF HNS Derivative 2

1-[[[[(3S,3aS,6aR)-Hexahydrofuro[2,3-b]furan-3-yl]oxy]carbonyl]oxy]-2,5-pyrrolidinedione is an impurity of TMC114, a bis-THF-derived compound that acts as an HIV-aspartyl protease inhibitor.