(1S,4R,4aR,5R,9R,9aS)-dimethyl 5-chloro-6-oxo-4,4a,5,6,9,9a-hexahydro-1H-1,4-epoxy-5,9-ethenobenzo[7]annulene-2,3-dicarboxylate

(1S,4R,4aR,5R,9S,9aS)-dimethyl 5-methoxy-6-oxo-4,4a,5,6,9,9a-hexahydro-1H-1,4-epoxy-5,9-ethenobenzo[7]annulene-2,3-dicarboxylate

dimethyl (1S,4R,4aS,5S,9S,9aS)-6-oxo-4,4a,5,6,9,9a-hexahydro-1H-1,4-epoxy-5,9-ethenobenzo[7]annulene-2,3-dicarboxylate

丁炔二酸二甲酯

4-苯基恶唑