2-(Hydroxymethyl)propenoic acid (3S,4'R)-3aβ,4,5,6,6aβ,7,8,9,9aβ,9bα-decahydro-4'-methyl-6,9-bismethylene-2-oxospiro[azuleno[4,5-b]furan-3(2H),2'-oxetan]-4β-yl ester;Subexpinnatin B
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