Spiro[furan-3(2H),7'(10'H)-[1H]naphtho[1,8a-c]furan]-2,3',10'(3'aH)-trione,5-(3-furanyl)-4,4',5,5',6',6'a-hexahydro-8'-methyl-, [3'aR-[3'aa,6'aa,7'b(S*),10'aR*]]-; Teupernin A
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