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Siregar, Vrili Coirala Rama Uli, Billingual Program of Chemistry Depatment, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Jl. Willem iskandar Ps. V, Medan estate, Indonesia. (Indonesia)
Sitepu, Deri S, Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)
Sitinjak, Elvri Melliaty, Department of Chemical Engineering, Politeknik Teknologi Kimia Industri, Medan (Indonesia)
Sitinjak, Elvri Melliaty, Department of Chemical Engineering, Politeknik Teknologi Kimia Industri, Medan 20228, Indonesia (Indonesia)
Sitompul, Bramwell, Organic Chemistry Laboratory, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara (Indonesia)
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