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.)L'invention concerne un composé représenté par la formule (I) ou un sel pharmaceutiquement acceptable correspondant. (Dans la formule (I) : L représente NR2R3, SR7, SO2R8, alkyle substitué ou non substitué ou alcényle substitué ou non substitué ； R2 représente un atome d'hydrogène, alkyle substitué ou non substitué, alcényle substitué ou non substitué, alcynyle substitué ou non substitué ou analogue ； R3 représente alkyle substitué ou non substitué, alcényle substitué ou non substitué, alcynyle substitué ou
