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Darmana, Ayi, Billingual Program of Chemistry Depatment, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Jl. Willem iskandar Ps. V, Medan estate, Indonesia. (Indonesia)
Darningsih, Ribka, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Daulay, Anny Sartika, Department of Pharmacy, Universitas Muslim Nusantara Al Washliyah (Indonesia)
Dewi, Ratna Sari, Department of Chemistry, Faculty of Mathematics and Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)
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