1,4-Methano-s-indacene-3a(1H)-carboxylic acid, 8a-[[(6-deoxy-4-O-methyl- .beta.-D-altropyranosyl)oxy]methyl]-4-formyl-4,4a,5,6,7,7a,8,8a-octahydro-7-methyl-3-(1-methylethyl)-, (1R,3aR,4S,4aR,7R,7aR,8aS)- 11076-17-8 AIDS-107822 AIDS107822 Sordarin