Spiro[3H-3a,6-ethanoisobenzofuran-4(1H),1'(3'H)-isobenzofuran]-1,3'-dione,3-butylidene-5,6,6',7'-tetrahydro-5-propyl-, [3aS-(3Z,3aa,4a,5a,6a)]-;(3'Z)-(3S,8R,3a'S,6'R)-3,3a':8,6'-Diligustilide; Tokinolide B
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