Provided is a compound having formula (I): wherein R2 is selected from -C1, -Br and -CN； R1 and R4 are independently selected from H and -F； R631, R632, R641 and R642 are independently selected from -H, -F and substituted or unsubstituted C1-C3 alkyl groups； and R651 and R652 are independently selected from H and substituted or unsubstituted C1-C3 alkyl groups and substituted or unsubstituted phenyl groups； and wherein at least one of R631, R632, R641, R642 and R652 is not -H, or wherein when all of R631, R632, R641, R642 and R652 are -H, R651 is not Me or Et.Se proporciona un compuesto que tiene la Formula (I): (ver formula) en donde R2 se selecciona de -Cl, Br y -CN； R1 y R4 se seleccionan independientemente de H y F； R631, R632, R641 y R642 se seleccionan independientemente de H, F y grupos alquilo C1-C3 sustituidos o no sustituidos； y R651 and R652 se seleccionan independientemente de H y grupos alquilo de C1-C3 sustituidos o no sustituidos y grupos fenilo sustituidos o no sustituidos； y en donde al menos uno de R631, R632, R641, R642 y R652 no es H, o en donde cuando todos de R631, R632, R641, R642 y R652 son H, R651 no es Me o Et.
