Sarumaha, Gracella Evangeline, Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan (Indonesia)
Savika, Anggraini, Faculty of Pharmacy, Universitas Muslim Nusantara Al-Washliyah, Medan (Indonesia)
Savitri, Astri Aulia, D III Pharmacy Study Program, Harapan Bersama Polytechnic, Tegal Indonesia Building A 3rd Floor Campus 1 JL. Mataram No. 09 Tegal City, Postal Code 52122 (Indonesia)
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Selly, Rini, Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Negeri Medan (Indonesia)

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