The present invention relates to: a compound represented by formula (I) or a pharmaceutically acceptable salt thereof； and a pharmaceutical composition which contains the compound or the salt.(In formula (I), R1 represents a hydrogen atom, a substituted or unsubstituted alkyl, a substituted or unsubstituted aromatic carbon ring group or the like； X represents -N(R3)-, -O- or -S-； Y represents =C(R4)- or =N-； Z represents -N(R7)-, -O- or -S-； R2 represents a substituted or unsubstituted alkyloxy or a group represented by formula -(CR2aR2b)n-R2c (wherein each R2a independently represents a hydrogen atom, a halogen or the like； each R2b independently represents a hydrogen atom, a halogen or the like； R2a and R2b bonded to the same carbon atom may combine together to form an oxo, a substituted or unsubstituted non-aromatic carbon ring or the like, and two R2a moieties bonded to adjacent carbon atoms and/or two R2b moieties bonded to adjacent carbon atoms may combine together to form a single bond； R2c represents a substituted or unsubstituted aromatic carbon ring group or the like； and n represents an integer of 1-3)； each of R3 and R7 independently represents a hydrogen tom, a substituted or unsubstituted alkyl or the like； each of R4 and R5 independently represents a hydrogen atom, a halogen, a substituted or unsubstituted alkyl or the like； and R6 represents a hydrogen atom, a halogen, a substituted or unsubstituted alkyl or the like.)La présente invention concerne : un composé représenté par la formule (I) ou un sel pharmaceutiquement acceptable de celui-ci ； et une composition pharmaceutique qui contient le composé ou le sel. (Dans la formule (I), R1 représente un atome d'hydrogène, un alkyle substitué ou non substitué, un groupe à noyau carboné aromatique substitué ou non substitué ou similaire ； X représente -N(R3)-, -O- ou -S- ； Y représente =C(R4)- ou =N- ； Z représente -N(R7)-, -O- ou -S- ； R2 représente un alkyloxy substitué ou non substitué ou un groupe re
