(3bR,4R,6aR)-3a-{[(3-O-Butyryl-6-deoxy-4-O-methyl-b-D-altropyranosyl)oxy]methyl}-7-formyl-1-isopropyl-4-methyl-3,3a,3b,4,5,6,6a,7-octahydro-7aH-3,7-methanocyclopenta[a]pentalene-7a-carboxylic acid AIDS-184340 AIDS184340