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Makarieva, Tatyana N.,Tabakmaher, Ksenya M.,Guzii, Alla G.,Denisenko, Vladimir A.,Dmitrenok, Pavel S.,Shubina, Larisa K.,Kuzmich, Alexandra S.,Lee, Hyi-Seung,Stonik, Valentin A. American Chemical Society and American Society of 2011 Journal of natural products Vol.74 No.9
<P>New unusual polycyclic guanidine alkaloids monanchocidins B–E (<B>2</B>–<B>5</B>) along with monanchocidin A (<B>1</B>), which we recently described, were isolated from the Far-Eastern marine sponge <I>Monanchora pulchra</I>. Their structures were established using spectroscopic data and chemical transformations. Compounds <B>1</B>–<B>5</B> show potent cytotoxic activities against HL-60 human leukemia cells with IC<SUB>50</SUB> values of 540, 200, 110, 830, and 650 nM, respectively.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jnprdf/2011/jnprdf.2011.74.issue-9/np200452m/production/images/medium/np-2011-00452m_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/np200452m'>ACS Electronic Supporting Info</A></P>