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Yunanda, M Yogi, Department of Chemistry , Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang (Indonesia)
Yuniarti, Rafita, Department of Pharmacy, Universitas Muslim Nusantara Al Washliyah (Indonesia)
Yusuf, Muhammad, Department of Chemistry Universitas Negeri Medan Jl. Willem Iskandar Pasar V Medan Estate, Medan 20221, Indonesia (Indonesia)
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