(−)-Berkelic acid

(2S,3S,3a′S,4S,5′R)-8′-Hydroxy-4-[(3S)-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

(−)-Berkelic acid

Berkelic acid

[Wiki]

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

(2S,3S,3a′S,4S,5′R)-8′-Hydroxy-4-[(3S)-3-(methoxycarbonyl)-3-methyl-2-oxopentyl]-3-methyl-5′-pentyl-3′,3a′,5′,6′-tetrahydrospiro[oxolane-2,2′-pyrano[2,3,4-de][1]benzopyran]-9′-carboxylic acid

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