6H-Benzofuro[3a,3,2-ef][2]benzazepine-11(12H)-carboxylic acid, 3-bromo-2-[[(2,2-dimethylpropoxy)carbonyl]oxy]-4a,5,7,8,9,10-hexahydro-8-[(2-hydroxyethyl)thio]-10-(hydroxymethyl)-6-oxo-, 2,2-dimethylpropyl ester, (4aR,8R,10S)- AIDS-185688 AIDS185688