(3R)-2,3,3aβ,4,5,7,9aβ,9bα-Octahydro-3β,6,9-trimethyl-2,7-dioxoazuleno[4,5-b]furan-3α,4β-diyl=bis[(Z)-2-methyl-2-butenoate];4-Angeloyloxypruteninone
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