5,6-Isopropylidenedioxyfuro[2,3-d]isoxazole-3-methanol derivative AIDS-096136 AIDS096136 [1,3]Dioxolo[4,5]furo[2,3-d]isoxazole, 3a,4a,7a,7b-tetrahydro-3,6,6-trimethyl-, (3aS,4aS,7aS,7bR)-