(3'R)-3'-Hydroxycolumbianadin 2-Butenoic acid, 2-methyl-, 1-[(8S,9R)-8,9-dihydro-9-hydroxy-2-oxo-2H-furo[2,3-h]-1-benzopyran-8-yl]-1-methylethyl ester, (2Z)- AIDS-185993 AIDS185993