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. 2017 Nov 21;17(11):2689. doi: 10.3390/s17112689

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© 2017 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Derivatization reaction of HCHO and 4-amino-5-hydrazino-3-mercapto-1,2,4-triazole (AHMT) under alkaline conditions (A) [18]. Synthesis of p-([8-hydroxyquinoline]azo)benzenethiol (SHQ) (B) [19].