Nugraha, Asep Wahyu, Department of Chemistry, Faculty of Mathematics and Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)
Nur, A Masrukhan, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Semarang State University, Semarang (Indonesia)
Nur, M Rosyadi Izzuddin, Department of Chemistry, Faculty of Mathematics and Natural Sciences, State University of Medan (Indonesia)
Nurfajriani, Nurfajriani, Chemistry department, Fakultas Matematika dan Ilmu Pengetahuan Alam, State University of Medan (Indonesia)
Nurfajriani, Nurfajriani, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)

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