QSAR study of the DPPH· radical scavenging activity of coumarin derivatives and xanthine oxidase inhibition by molecular docking oleh Razo-Hernández Rodrigo, Pineda-Urbina Kayim, Velazco-Medel Marlene, Villanueva-García Manuel, Sumaya-Martínez M., Martínez-Martínez Francisco, Gómez-Sandoval Zeferino