Sidabutar, Putri Yanita, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Siggalingging, Nelsy Theresia, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Medan State University, Medan (Indonesia)
Sihaloho, Predy Fernandes, Chemistry Departement, Universitas Negeri Medan (Indonesia)
Sihite, Judika A.M, Department of Biology, Faculty of Mathematics and Natural Sciences, State University of Medan (Indonesia)
Sihombing, Junifa Layla, Department of Chemistry, Faculty of Mathematic and Natural Science, Universitas Negeri Medan

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