Spiro[4,7-ethenoisobenzofuran-5(3H),2'(3'H)-furan]-1,3(4H)-dione,3a,6,7,7a-tetrahydro- (9CI);Spiro[bicyclo[2.2.2]oct-7-ene-2,2'(3'H)-furan]-5,6-dicarboxylic anhydride (8CI)
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