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Rahmah, Siti, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Medan State University, Medan (Indonesia)
Rajagukguk, Mega Evelin, Organic Chemistry Laboratory, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara (Indonesia)
Ramadhan, Ahmad, Jurusan Kimia FMIPA Universitas Negeri Medan
Ramadhani, Esti, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang (Indonesia)
rangkuti, Septi Lumongga Duma
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