Aminobenzoic acid derivatives

An aminobenzoic acid derivative represented by Formula (1) as follows:

• {in Formula (1), R1 represents a hydrogen atom or a C1-6alkyl group;
• R2 represents a hydrogen atom, a C1-6alkyl group, a C3-8 cycloalkyl C1-3alkyl group, a phenyl C1-3alkyl group, a group represented by CH2CO2R5 (wherein R5 represents a hydrogen atom or a C1-6alkyl group), or a group represented by CH2CON(R6)R7 (wherein R6 and R7 independently represent a hydrogen atom or a C1-6alkyl group);
• R3 represents a C8-25alkyl group, a group represented by (CH2)pCO2R11 (where in p is an integer of 1 to 20, and R11 represents a hydrogen atom or a C1-6alkyl group), or a group represented by (CH2)3CONHCH (R12)CONHR 1 (wherein R12 represents a hydrogen atom or a group represented by CH2CO2R14 group (wherein R14 represents a hydrogen atom or a C1-6alkyl group), and R13 represents a C1-20 alkyl group);
• R4 represents a hydrogen atom or a group represented by OR9 or CO2R10 (wherein R9 and R10 independently represent a hydrogen atom or a C1-6alkyl group),
• A represents a group represented by S(O)qR15 (wherein q is 0, 1, or 2, R15 represents a C1-6alkyl group, a phenyl C1-3alkyl group, or a group represented by (CH2)mOR16 (wherein m is 2 or 3, and R16represents a hydrogen atom or a methoxymethyl group)), a group represented by Formula (2) as follows:
• (in the formula, R17 represents a hydrogen atom or a group represented by CO2R19, CH2CO2R20, CH2CH2CO2R21, or CH═CHCO2R22 (wherein R19, R20, R21, and R22 independently represent a hydrogen atom or a C1-6alkyl group), R18 represents a hydrogen atom or a group represented by CO2R23 (wherein R23 represents a hydrogen atom or a C1-6alkyl group), Y′ represents O, S, or NR24 (wherein R24 represents a hydrogen atom or a C1-6alkyl group), and Z represents CH or N), or a group represented by Formula (3) as follows:
• (in the formula, R25 represents a hydrogen atom or a group represented by CO2R26 (wherein R26 represents a hydrogen atom or a C1-6alkyl group));
• X represents O, a single bond, or a group represented by NR27 (wherein R27 represents a hydrogen atom or a t-butoxycarbonyl group);
• Y represents O, CONH, NHCO, or a group represented by NR28 (wherein R28 represents a hydrogen atom or a t-butoxycarbonyl group, with the proviso that when Y represents NHCO, A is not represented by Formula (2) described above);
• and
• n is an integer of 0 to 15} or a pharmaceutically acceptable salt of the same.