摘要 |
Compounds represented by formulae (I, II or III), wherein U is CH, O, or S; Z is -C(R2)(R3), -CH-N(R2)(R3), C(R3)¢(CH2)nR2!, CH-C(R3)(R8)(CH2)nR2, C¢(CH2)nR2!-¢CH(R3)(R8)!, C¢(R3)!¢CH¢(CH2)nR2!(R8)!; R1 is H, (CH2)nOH, (CH2)nNH2, (CH2)nNR10R11, (CH2)nOR11, (CH2)nSR11, or (CH2)n halogen; R9 is (CH2)nCO2H, (CH2)nSO3H, (CH2)nPO3H2, (CH2)nNO2, CH(SCH3)3, esters thereof, or salts thereof.
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