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. 2017 Oct 27;22(11):1831. doi: 10.3390/molecules22111831

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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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Chemical structure of harmine (7-methoxy-1-methyl-9H-pyrido(3,4-b)indole), and its synthetic derivatives: I (4-methoxy-1-methyl-9H-pyrido(3,4-b)indole), II (4-methoxy-1,9-dimethyl-9H-pyrido(3,4-b)indole), and III (3-benzyl-1-methoxy-6-oxo-6H-indole[3,2,1-de]-[1,5]-naphthyridinin-3-ium bromide).