1, 4-Methanoindan-1-acetic acid, hexahydro-.alpha.,3a,5-trimethyl-6, 8-dioxo- 1,4-Methano-1H-indene-1-acetic acid, octahydro-.alpha.,3a,5-trimethyl-6,8-dioxo-, {[1R-[1.alpha.,1(S*),} 3a.beta.,4.alpha.,5.alpha.,7a.beta.\]\]- 510-35-0 AIDS-127043 AIDS127043 NSC138622 Santonic acid