spiro-(5,5)-2,3-benzo-6-methyleneundeca-7,9-diene

5,6-二亚甲基环己-1,3-二烯

2,3-萘磺酸二甲基乙酸酯

dimethyl 1,4-dihydronaphthalene-2,3-dicarboxylate

1,2,3,4-tetrahydronaphthalene-2,3-dicarboxylic acid anhydride