. 2024 Jun 7;12:1419242. doi: 10.3389/fchem.2024.1419242
Copyright © 2024 Al-Wahaibi, Mahmoud, Alzahrani, Abou-Zied, Gomaa, Youssif, Bräse and Rabea.
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SCHEME 2.
Impurities formed due to excess formaldehyde in the initial condensation step.