<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1870-249X</journal-id>
<journal-title><![CDATA[Journal of the Mexican Chemical Society]]></journal-title>
<abbrev-journal-title><![CDATA[J. Mex. Chem. Soc]]></abbrev-journal-title>
<issn>1870-249X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Química de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-249X2006000400003</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[8,9-Seco-Eremophilanolides from Roldana ehrenbergiana]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Castorena]]></surname>
<given-names><![CDATA[Ana-L.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arciniegas]]></surname>
<given-names><![CDATA[Amira]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[Ma. Lourdes]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Toscano]]></surname>
<given-names><![CDATA[Rubén Alfredo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Contreras]]></surname>
<given-names><![CDATA[José L.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romo de Vivar]]></surname>
<given-names><![CDATA[Alfonso]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Química ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Benemérita Universidad Autónoma de Puebla Herbario ]]></institution>
<addr-line><![CDATA[Puebla ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2006</year>
</pub-date>
<volume>50</volume>
<numero>4</numero>
<fpage>157</fpage>
<lpage>159</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2006000400003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2006000400003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2006000400003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Two new seco-eremophilanolides, roldehrenbergins C and D, were isolated from Roldana ehrenbergiana. Structural elucidation was achieved by spectroscopic methods and confirmed by X-ray crystallographic analysis.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Dos seco-eremofilanólidas, roldehrenberginas C y D, fueron aisladas de Roldana ehrenbergiana. La elucidación estructural se llevó a cabo por métodos espectroscópicos y confirmada por análisis cristalográfico de rayos-X.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Roldana ehrenbergiana]]></kwd>
<kwd lng="en"><![CDATA[Asteraceae]]></kwd>
<kwd lng="en"><![CDATA[Senecioneae]]></kwd>
<kwd lng="en"><![CDATA[Hierba del Perro]]></kwd>
<kwd lng="en"><![CDATA[seco-eremophilanolides]]></kwd>
<kwd lng="es"><![CDATA[Roldana ehrenbergiana]]></kwd>
<kwd lng="es"><![CDATA[Asteraceae]]></kwd>
<kwd lng="es"><![CDATA[Senecioneae]]></kwd>
<kwd lng="es"><![CDATA[Hierba del Perro]]></kwd>
<kwd lng="es"><![CDATA[seco-eremofilanólidas]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Article</font></p> 	    <p align="justify">&nbsp;</p> 	    <p align="center"><font face="verdana" size="4"><b>8,9&#45;Seco&#45;Eremophilanolides from <i>Roldana ehrenbergiana&dagger;</i></b></font></p> 	    <p align="justify">&nbsp;</p> 	    <p align="center"><font face="verdana" size="2"><b>Ana&#45;L. P&eacute;rez&#45;Castorena,*<sup>1</sup> Amira Arciniegas,<sup>1</sup> Ma. Lourdes Hern&aacute;ndez,<sup>1</sup> Rub&eacute;n Alfredo Toscano,<sup>1</sup> Jos&eacute; L. Contreras,<sup>2</sup> Alfonso Romo de Vivar<sup>1</sup></b><sup></sup></font></p> 	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><sup><i>1</i></sup><i>&nbsp;Instituto de Qu&iacute;mica, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Circuito Exterior, Ciudad Universitaria, M&eacute;xico 04510, M&eacute;xico. Phone: (5255) 56&#45;224412. Fax (5255) 56&#45;162217. </i>E&#45;mail <a href="mailto:alperezc@servidor.unam.mx">alperezc@servidor.unam.mx</a></font></p> 	    <p align="justify"><font face="verdana" size="2"><sup><i>2</i></sup><i>&nbsp;Herbario, Benem&eacute;rita Universidad Aut&oacute;noma de Puebla, Av. San Claudio s/n, San Manuel, Puebla, M&eacute;xico.</i></font></p> 	    <p align="justify">&nbsp;</p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido el 16 de agosto del 2006.     <br> Aceptado el 4 de octubre de 2006</font>.</p>     <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p> 	    <p align="justify"><font face="verdana" size="2"> Two new <i>seco</i>&#45;eremophilanolides, roldehrenbergins C and D, were isolated from <i>Roldana ehrenbergiana.</i> Structural elucidation was achieved by spectroscopic methods and confirmed by X&#45;ray crystallographic analysis.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key Words:</b> <i>Roldana ehrenbergiana,</i> Asteraceae, Senecioneae, Hierba del Perro, seco&#45;eremophilanolides.</font></p>  	    <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2"> Dos <i>seco</i>&#45;eremofilan&oacute;lidas, roldehrenberginas C y D, fueron aisladas de <i>Roldana ehrenbergiana.</i> La elucidaci&oacute;n estructural se llev&oacute; a cabo por m&eacute;todos espectrosc&oacute;picos y confirmada por an&aacute;lisis cristalogr&aacute;fico de rayos&#45;X.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras Clave:</b> <i>Roldana ehrenbergiana,</i> Asteraceae, Senecioneae, Hierba del Perro, seco&#45;eremofilan&oacute;lidas. </font></p> 	    ]]></body>
<body><![CDATA[<p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/jmcs/v50n4/v50n4a3.pdf" target="_blank">DESCARGAR ARCHIVO EN FORMATO PDF</a></font></p>  	    <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. Funston, A. M., Ph. D. Thesis. A Revision of the Genus <i>Roldana</i> (Asteraceae: Senecioneae). Kansas State University, KS, USA. 1999.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4935403&pid=S1870-249X200600040000300001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">2. Bohlmann, F.; Zdero, C. <i>Phytochemistry</i> <b>1978,</b> <i>17,</i> 565&#45;566.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4935405&pid=S1870-249X200600040000300002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">3. Joseph&#45;Nathan, P.; Villag&oacute;mez, J. R.; Rom&aacute;n, L. U.; Hern&aacute;ndez, J. D. <i>Phytochemistry</i> <b>1990,</b> <i>29</i>, 977&#45;979.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4935407&pid=S1870-249X200600040000300003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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