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        羧酸衍生物

      2. 锦州生产厂家低价销售优质二甲苯|山东济南二甲苯现货;
      3. 四川景玉化工供应D-对甲基二苯甲酰酒石酸一水物(CAS:71607-32-4);
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      9. 厂家直销煤焦油再生胶专用中温固体煤焦油;
      10. 4,4'-二苯乙烯二羧酸, CAS 100-31-2,芪二酸,阿拉丁试剂;
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