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5-庚烯-2,3-二羧酸单甲酯##5-降冰片烯-2,3-二羧酸一甲酯##5-降冰片烯-2,3-二羚酸一甲酯##5-降冰片烯-2,3-二甲酸单甲酯##双环[2.2.1]-5-庚烯-2,3-二羧酸单甲醚##3-(甲氧基羰基)双环[2.2.1]庚烷-5-烯-2-羧酸
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