Synonyms: Spiro[1,5-epoxy-4H-cyclohepta[c]furan-4,2'(3'H)-[4H]furo[3,2-c]pyran]-5(1H)-carboxylicacid,6-(3-furanylcarbonyl)-3,3a,3'a,6,6',7,8,8a-octahydro-1,3a,4',4',6-pentamethyl-3,6'-dioxo-,methyl ester, [1R-[1a,3ab,4b(3'aS*),5a,6a,8ab]]-; (-)-Brownin H; Brownin H