3,5-Cyclohexadiene-1,2-dione, 5-[(5R,5aS,8aS,9R)-5,5a,6,8,8a,9-hexahydro-9-hydroxy-6-oxofuro[3',4':6,7]naphtho[2,3-d]-1,3-dioxol-5-yl]-3-methoxy- AIDS-184875 AIDS184875