Simatupang, Lisnwaty, Chemistry Department, Faculty of Mathemathics and Natural Science, Universitas Negeri Medan (Indonesia)
Simatupang, Veronika Meiyuina, Dapertemen Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan (Indonesia)
Simbolon, Emma Juli Anamasta, Organic Chemistry Laboratory, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Medan 20155, Indonesia (Indonesia)
Simbolon, Lovandi F, Department of Chemistry, Faculty of Mathematics and Science, Universitas Negeri Medan, Medan (Indonesia)
Simbolon, Ryandi, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan

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