(3S)-3aβ,5,5a,6,7,9,9aα,9bα-Octahydro-3,5aα,9α-trimethylnaphtho[1,2-b]furan-2,8(3H,4H)-dione;(3S)-3aβ,5,5a,6,7,9,9aα,9bα-Octahydro-3β,5aα,9α-trimethylnaphtho[1,2-b]furan-2,8(3H,4H)-dione;β-Tetrahydrosantonin;β-Tetrahydro-α-santonin
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