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Harahap, Aura F, Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)
Hardi, Jaya, Chemistry Department, Faculty of Mathematics and Natural Sciences, Tadulako University, Palu (Indonesia)
Hayati, Nurwani
Herliana, Herliana, Organic Chemistry Laboratory, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara (Indonesia)
Herlinawati, Herlinawati, Universitas Negeri Medan (Indonesia)
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