(+)-5'-Demethoxyepiexcelsin 6-(6-(2H-Benzo[3,4-d]1,3-dioxolen-5-yl)(2S,6R)-3,7-dioxabicyclo[3.3.0]oct-2-yl)-4-methoxy-2H-benzo[d]1,3-dioxolene AIDS-113497 AIDS113497