Simanjuntak, Debora P, Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)
Simanjuntak, Maria Enjelita, Chemistry Department, Universitas Negeri Medan, Jl. Willem Iskandar, Pasar V, Medan 20221, Indonesia (Indonesia)
Simatupang, Endang, Organic Chemistry Laboratory, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Medan 20155, Indonesia (Indonesia)
Simatupang, Lisnawaty, Universitas Negeri Medan (Indonesia)
Simatupang, Lisnawaty, Department of Chemistry- Faculty of Mathematics and Natural Sciences Universitas Negeri Medan

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