Compound of the formula (I) ** Formula ** in which R1 represents hydrogen or fluorine, L1 represents ethan-1,2-diyl or 1,4-phenylene, and A represents a group of the formula ** Formula ** where * indicates the respective point of attachment to the rest of the molecule, L3 means a bond, -O-, -CH2-, -CH2-CH2- or -CH>； = CH-, and R3C means a substituent selected from the group of fluorine, chlorine, bromine, cyano, (C1-C4) alkyl, difluoromethyl, trifluoromethyl, (C1-C4) alkoxy, difluoromethoxy and trifluoromethoxy, and R3D means a substituent selected from the group of hydrogen, fluorine, chlorine, bromine, cyano, (C1-C4) alkyl, difluoromethyl, trifluoromethyl, (C1-C4) alkoxy, difluoromethoxy and trifluoromethoxy, as well as their salts, solvates and solvates of the salts.Compuesto de la fórmula (I) **Fórmula** en el que R1 representa hidrógeno o flúor, L1 representa etan-1,2-diilo o 1,4-fenileno, y A representa un grupo de la fórmula**Fórmula** en la que * indica el punto de enlace respectivo al resto de la molécula, L3 significa un enlace, -O-, -CH2-, -CH2-CH2- o -CH>；=CH-, y R3C significa un sustituyente seleccionado del grupo de flúor, cloro, bromo, ciano, alquilo (C1-C4), difluorometilo, trifluorometilo, alcoxi (C1-C4), difluorometoxi y trifluorometoxi, y R3D significa un sustituyente seleccionado del grupo de hidrógeno, flúor, cloro, bromo, ciano, alquilo (C1-C4), difluorometilo, trifluorometilo, alcoxi (C1-C4), difluorometoxi y trifluorometoxi, así como sus sales, solvatos y solvatos de las sales.
