They act as antagonists for histamine H2 receptors (van der Goot et al., 1994). In addition they show anticancer (Zaharia et al., 2013; Zhao et al., 2013; Hong et al., 2015), antimicrobial (Al-Rubaie et al., 2014; Laczkowski et al., 2016; Mbaveng et al., 2016; Filipoviet al., 2017), c and xantine oxidase inhibitory activities (Smelceroviet al., c 2017). The biological activity (1,3-selenazol-2-yl)hydrazones is reasonably unexplored region of investigation: only two studies coping with anticancer (Zaharia et al., 2013; Zhao et al., 2013) and 3 research coping with antimicrobial activity (Laczkowski et al., 2016; Mbaveng et al., 2016; Filipovic et al., 2017) of (1,3-selenazol-2-yl)hydrazones happen to be published as much as now. Despite the truth that (1,3-selenazol-2yl)hydrazones are structurally connected to their sulfur analogs, that are well known as potent monoamine oxidases (MAO) A/B inhibitors (Secci et al., 2012; Carradori et al., 2018; OncCan et al., 2018; Tripathi et al., 2018) with good antioxidative properties, there’s no study of MAO A/B inhibition capacity of this class of selenium compounds for the greatest of our information. Our recent study on pyridine-based (1,3chalcogenazole-2-yl)hydrazones revealed that selenium-based compounds exhibited reduced toxicity and superior antioxidant properties in comparison to their sulfur 90-33-5 Epigenetics analogs (Filipoviet al., c 2017). Modern day treatment of complex multifactorial illnesses, for instance cancer and neurodegeneration, is transferred from improvement of single-targeting agents to simultaneous interactions with many targets by way of multi-targeting agents (MTAs) (Talevi, 2015). Each, neurodegeneration and cancer have their very own molecular targets which have to be viewed as for style of novel MTAs. Within the case of neurodegeneration, monoamine oxidases (MAO) A/B are suggested as one of the main targets for design of novel MTAs (Ramsay et al., 2016), whilst novel MTAs for the remedy of cancer are focused on targets like DNA and cancer-related proteins (Fu et al., 2017). Having said that, since oxidative anxiety drastically contributes for the pathogenesis of cancer and neurodegeneration, novel effective MTAs ought to possess also great antioxidant properties (Let al., 2010; Carradori et al., 2018). Since biological activity is influenced by the structural and molecular properties, especially electronic properties, future prospects for design and style and improvement of new compounds with possible targeted biological activity can be based around the information obtained from experimental and theoretical results. In this perform we designed a focused library of 12 structurally related benzylidene-based (1,3-selenazol-2yl)hydrazones (Figure 1) and tested their antiproliferative, antioxidative and MAO A/B inhibition properties. In order to evaluate the multi-targeting properties of investigated compounds to each, Parkinson’s disease and cancer, doable targets for one of the most active compounds were recommended by the similarity ensemble approach (SEA) (Keiser et al., 2007).Frontiers in Chemistry | www.frontiersin.orgJuly 2018 | Volume six | ArticleElshaflu et al.Selenazolyl-hydrazones as MAO Inhibitorsanalyzer. Elemental analyses are within .four , confirming 95 purity. Infra-red (IR) spectra were recorded on a Thermo Scientific Nicolet 6700 FT-IR spectrometer by the Attenuated Total Reflection (ATR) technique in the region 4,00000 cm-1 . Abbreviations made use of for IR spectra: vs, extremely sturdy; s, robust; m, medium; w, weak. The NMR spectra (1D and 2D) had been record.