| 摘要 |
A compound of the formula: <CHEM> wherein R<1> is a hydrogen atom or a methyl group, R<2> is a hydrogen atom or a negative charge, R<3> is a hydrogen atom, a halogen atom, a hydroxyl group, a lower alkoxy group, a lower alkanoyloxy group, an amino group, an N-lower alkylamino group, an N,N-di-lower alkylamino group, a lower alkanoylamino group, an aroylamino group, a (lower alkylsulfonyl)amino group, a sulfamoylamino group, a cyano group, a nitro group, a group of -COOR<4> (wherein R<4> is a hydrogen atom or a lower alkyl group) or a group of -CON(R<5>)R<6> (wherein each of R<5> and R<6> which may be the same or different, is a hydrogen atom or a lower alkyl group, or R<5> and R<6> form together with the adjacent nitrogen atom a heterocyclic group selected from the group consisting of an aziridinyl group, an azetidinyl group, a pyrrolidinyl group, a piperidyl group, a piperazinyl group, a 4-lower alkyl piperazinyl group and a morpholino group), A is a linear or branched lower alkylene group, X is a group of -N(R<7>)R<8> (wherein each of R<7> and R<8> which may be the same or different, is a hydrogen atom or a lower alkyl group) or a group of -N<+>(R<9>)(R<1><0>)R<1><1> (wherein each of R<9>, R<1><0> and R<1><1> which may be the same or different, is a lower alkyl group), provided that when A is a linear lower alkylene group, R<3> is other than a hydrogen atom; or a pharmaceutically acceptable salt or ester thereof. |
