Sitompul, Bramwell, Organic Chemistry Laboratory, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara (Indonesia)
Sitompul, Maysaro, Faculty of Pharmacy, Universitas Muslim Nusantara Al-Washliyah, Medan (Indonesia)
Sitompul, Nopita, Natural Science Study Program, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Jl. Willem iskandar Ps. V, Medan estate, Indonesia. (Indonesia)
Sitorus, Catherine S.Lorentz, Department of Chemistry, Faculty Of Mathematic and Natural Sciences, State University Of Medan (Indonesia)
Sitorus, Marham, Universitas Negeri Medan (Indonesia)

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