Spiro[furan-3(2H),1'(7'H)-naphthalene]-2,7'-dione,5-(3-furanyl)-2',3',4,4',4'a,5,8',8'a-octahydro-2',5'-dimethyl-, [1'R-[1'a(R*),2'a,4'aa,8'ab]]-; Dehydrocrotonin; trans-Dehydrocrotonin
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