(2S,3R,3a′S,4R,5′R)-8′-Hydroxy-4-[3-(methoxycarbonyl)-3-methyl-2-oxopentyl]-3-methyl-5′-pentyl-3′,3a′,4,5,5′,6′-hexahydro-3H-spiro[furan-2,2′-pyrano[2,3,4-de]chromene]-9′-carboxylic acid

(2S,3R,3a′S,4R,5′R)-8′-Hydroxy-4-[3-(methoxycarbonyl)-3-methyl-2-oxopentyl]-3-methyl-5′-pentyl-3′,3a′,4,5,5′,6′-hexahydro-3H-spiro[furan-2,2′-pyrano[2,3,4-de]chromene]-9′-carboxylic acid

Spiro[furan-2(3H),2′-[2H]pyrano[2,3,4-de][1]benzopyran]-4-butanoic acid, 9′-carboxy-α-ethyl-3′,3′a,4,5,5′,6′-hexahydro-8′-hydroxy-α,3-dimethyl-β-oxo-5′-pentyl-, α-methyl ester, (2S,3R,3 ′aS,4R,5′R)-

(−)-Berkelic acid

BERKELIC ACID