(5R,5aR,8aS,9R) 9-Acetoxy-5-(4-methoxy-7(8)-methylphenazin-2-yl)-5,5a,6,8,8a,9-hexahydro-furo[3'4':6,7]naphtho[2,3-d][1,3]dioxoll-6-one AIDS-184878 AIDS184878