A compound represented by formula (I) or a pharmaceutically acceptable salt thereof. (In formula (I): L represents NR2R3, SR7, SO2R8, a substituted or unsubstituted alkyl, or a substituted or unsubstituted alkenyl R2 represents a hydrogen atom, a substituted or unsubstituted alkyl, a substituted or unsubstituted alkenyl, a substituted or unsubstituted alkynyl, or the like R3 represents a substituted or unsubstituted alkyl, a substituted or unsubstituted alkenyl, a substituted or unsubstituted alkynyl, or the like R7 represents a hydrogen atom, a substituted or unsubstituted alkyl, a substituted or unsubstituted alkenyl, a substituted or unsubstituted alkynyl, or the like R8 represents a hydrogen atom, a substituted or unsubstituted alkyl (but not an unsubstituted methyl or an unsubstituted ethyl), a substituted or unsubstituted alkenyl, a substituted or unsubstituted alkynyl, or the like Y represents a substituted or unsubstituted alkyl (but not an unsubstituted methyl or an unsubstituted ethyl), a substituted or unsubstituted alkenyl, a substituted or unsubstituted alkynyl, a substituted or unsubstituted aryl, or the like Z represents -CR6= or -N= R1 represents a hydrogen atom or a substituted or unsubstituted alkyl and R4, R5, and R6 are each independently a hydrogen atom, a halogen, a hydroxyl, a cyano, a nitro, a carboxy, a substituted or unsubstituted alkyl, a substituted or unsubstituted alkenyl, a substituted or unsubstituted alkynyl, or the like.).La presente invención se refiere a un compuesto representado por la fórmula: (ver Fórmula) o su sal farmacéuticamente aceptable, en donde L es NR2R3, SR7, SO2R8, alquilo sustituido o no sustituido, o alquenilo sustituido o no sustituido R2 es hidrógeno, alquilo sustituido o no sustituido, alquenilo sustituido o no sustituido, alquinilo sustituido o no sustituido, o similares R3 es hidrógeno, alquilo sustituido o no sustituido, alquenilo sustituido o no sustituido, alquinilo sustituido o no sustituido, o similares R
