<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Quírico A Castillo</style></author><author><style face="normal" font="default" size="100%">José M. Padrón</style></author><author><style face="normal" font="default" size="100%">Anastacio Emiliano</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Secondary Metabolites from Pterocaulon alopecuroides and their Antiproliferative Activities</style></title><secondary-title><style face="normal" font="default" size="100%">Pharmacognosy Journal</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">4´-dihydroxy-7-(γ</style></keyword><keyword><style  face="normal" font="default" size="100%">5</style></keyword><keyword><style  face="normal" font="default" size="100%">Antiproliferative activities</style></keyword><keyword><style  face="normal" font="default" size="100%">Coumarins</style></keyword><keyword><style  face="normal" font="default" size="100%">Flavonoids</style></keyword><keyword><style  face="normal" font="default" size="100%">Pterocaulon alopecuroides</style></keyword><keyword><style  face="normal" font="default" size="100%">γ-dimethylallyloxy)dihydroflavonol</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2019</style></year><pub-dates><date><style  face="normal" font="default" size="100%">May 2019</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">11</style></volume><pages><style face="normal" font="default" size="100%">493-495</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p class=&quot;rtejustify&quot;&gt;&lt;strong&gt;Objective:&lt;/strong&gt; To isolate secondary metabolites from the aerial parts of &lt;em&gt;Pterocaulon alopecuroides&lt;/em&gt;, elucidate their structures and evaluate their antiproliferative activities on selected human cancer cell lines. &lt;strong&gt;Materials and Methods:&lt;/strong&gt; The ethanolic extract of &lt;em&gt;P. alopecuroides&lt;/em&gt; afforded five compounds, which were characterized using spectroscopic techniques and by comparison with data from the literature. Antiproliferative activities of all isolates were evaluated. &lt;strong&gt;Results:&lt;/strong&gt; The compounds 7-(2,3-dihydroxy-3-methylbutoxy)-6-methoxycoumarin (&lt;strong&gt;1&lt;/strong&gt;), 5,6-methylenedioxy- 7-(2,3-dihydroxy-3-methylbutoxy) coumarin (&lt;strong&gt;2&lt;/strong&gt;), Dihydrokaempferol (&lt;strong&gt;3&lt;/strong&gt;), 5,7,4´-trihydroxy- 6-(α,α-dimethylallyl)dihydroflavonol (&lt;strong&gt;4&lt;/strong&gt;) and 5,4´-dihydroxy-7-(γ,γ-dimethylallyloxy)dihydroflavonol (&lt;strong&gt;5&lt;/strong&gt;) were isolated. The antiproliferative activity of all compounds was evaluated in a panel of six human solid tumor cell lines showing GI&lt;sub&gt;50 &lt;/sub&gt;values for the most active compounds in the low micromolar range. &lt;strong&gt;Conclusion:&lt;/strong&gt; Compound &lt;strong&gt;2&lt;/strong&gt; is reported for first time from &lt;em&gt;P. alopecuroides&lt;/em&gt;. Isolated coumarins show no antiproliferative activity, whilst among flavonoids compound &lt;strong&gt;5&lt;/strong&gt; showed the best antiproliferative activity.&lt;/p&gt;
</style></abstract><issue><style face="normal" font="default" size="100%">3</style></issue><work-type><style face="normal" font="default" size="100%">Original Article</style></work-type><section><style face="normal" font="default" size="100%">493</style></section><auth-address><style face="normal" font="default" size="100%">&lt;p class=&quot;rtejustify&quot;&gt;&lt;strong&gt;Quírico A Castillo&lt;sup&gt;1,*&lt;/sup&gt;, José M. Padrón&lt;sup&gt;2&lt;/sup&gt;, Anastacio Emiliano&lt;sup&gt;3&lt;/sup&gt; &lt;/strong&gt;&lt;/p&gt;

&lt;p class=&quot;rtejustify&quot;&gt;&lt;sup&gt;1&lt;/sup&gt;Escuela de Química and Instituto de Química, Universidad Autónoma de Santo Domingo (UASD), Facultad de Ciencias, Ciudad Universitaria, Santo Domingo, D.N., DOMINICAN REPUBLIC.&lt;/p&gt;

&lt;p class=&quot;rtejustify&quot;&gt;&lt;sup&gt;2&lt;/sup&gt;BioLab, Instituto Universitario de Bio-Orgánica “Antonio González” (IUBO-AG), Centro de Investigaciones Biomédicas de Canarias (CIBICAN), Universidad de La Laguna, 38206, La Laguna, SPAIN.&lt;/p&gt;

&lt;p class=&quot;rtejustify&quot;&gt;&lt;sup&gt;3&lt;/sup&gt;Universidad Ana G. Méndez at Gurabo, PO Box 3030, Gurabo, PR 00778, PUERTO RICO.&lt;/p&gt;
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