Abstract: A compound of formula (I): (wherein R1-R10 are each independently hydrogen, halogen, optionally substituted lower alkyl or the like, X1 is —O—, —S—, —NR11— (wherein R11 is hydrogen, lower alkyl or the like), —CR12R13CO—, —(CR12R13)mO—, —O(CR12R13)m- (wherein R12 and R13 are each independently hydrogen or lower alkyl and m is a integer between 1 and 3) or the like, X2 is a bond, —O—, —S—, —NR14— (wherein R14 is hydrogen, lower alkyl or the like, R14 and R6 can be taken together with the neighboring atom to form a ring) or —CR15R16— (wherein R15 and R16 are each independently hydrogen or lower alkyl, R15 and R6 or R10 can be taken together with the neighboring carbon atom to form a ring, R16 and R9 can be joined together to form a bond), X3 is COOR17, C(?NR17)NR18OR19 or the like), a pharmaceutically acceptable salt or a solvate thereof.