3- (6- (1- (2,2-Difluorobenzo [d] [1,3] dioxol-5-yl) cyclopropanecarboxamide) -3-methylpyridin-2-yl) benzoic acid, called Form I; so that Form I is characterized by showing one or more peaks at 15.2-15.6 degrees, 16.1-16.5 degrees and 14.3-14.7 degrees in an X-ray diffraction by the method of powder that has been obtained using Cu K alpha radiation at 40 kV, 35 mA.Ácido 3-(6-(1-(2,2-difluorobenzo[d][1,3]dioxol-5-il) ciclopropanocarboxamida)-3-metilpiridin-2-il) benzoico, denominado Forma I; de manera que la Forma I se caracteriza por mostrar uno o más picos a 15,2-15,6 grados, 16,1-16,5 grados y 14,3-14,7 grados en una difracción de rayos X por el método de polvo que se ha obtenido usando radiación alfa de Cu K a 40 kV, 35 mA.