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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, Marham, Jurusan Kimia, FMIPA Universitas Negeri Medan (Indonesia)
Sitorus, Marham, Universitas Negeri Medan (Indonesia)
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