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| MODAK, BRENDA, TORRES, RENÉ and URZÚA, ALEJANDRO SEASONAL VARIATION OF THE FLAVONOIDS PINOCEMBRIN AND 3-O-METHYLGALANGIN, IN THE SURFACE COMPONENT MIXTURE (RESINOUS EXUDATES AND WAXY COATING) OF HELIOTROPIUM STENOPHYLLUM. J. Chil. Chem. Soc., 2011, vol.56, no.1, p.532-534. ISSN 0717-9707
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