Amelia, Fitri, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang (Indonesia)
Amin, Muhammad Rahmatullah, Pendidikan Teknik Bangunan, Universitas Negeri Medan (Indonesia)
Anggini, Cindy, Organic Chemistry Laboratory, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Medan 20155, Indonesia (Indonesia)
Annauli G, Osi, Billingual Program of Chemistry Depatment, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Jl. Willem iskandar Ps. V, Medan estate, Indonesia. (Indonesia)
Annisa, Khairatun, Departemen of Chemistry, Faculty of Mathematics and Natural Sciences, State University of Medan (Indonesia)

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