Novel Fe(Ⅱ)and Co(Ⅱ)complexes of natural product tryptanthrin:synthesis and binding with G-Quadruple

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  Tryptanthrin is one of the most important members of indoloquinoline alkaloids.We obtained this alkaloid from Isatis and two novel Fe(Ⅱ)and Co(Ⅱ)complexes of tryptanthrin and their G-quadruplex binding properties were first synthesized and characterized.
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