Sari, Teti Purwita, Organic Chemistry Laboratory, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara (Indonesia)
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)
Selly, r, Department of Chemistry, Faculty of Mathematics and Natural Sciences, State University of medan (Indonesia)

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