(3aα,6aα)-Hexahydro-6α-butyl-3α-methylfuro[3,4-b]furan-2,4-dione
(3aα,6aα)-Hexahydro-6α-butyl-3α-methylfuro[3,4-b]furan-2,4-dione ??
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(3aα,6aα)-Hexahydro-6α-butyl-3α-methylfuro[3,4-b]furan-2,4-dione ?? ?? ? ???
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(3aα,6aα)-Hexahydro-6α-butyl-3α-methylfuro[3,4-b]furan-2,4-dione ?? ??
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