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机译:
Tech Univ Dortmund, Dept Chem & Chem Biol, Inst Environm Res INFU, D-44221 Dortmund, Germany;
Univ Maroua, Higher Teachers Training Coll, Dept Chem, Maroua, Cameroon;
environmental chemistry; isotope labeling; mass spectrometry; natural products; tramadol;