Chemical compounds

A compound of Formula I

• wherein R1 is H, Cl, Br, N(CH3)2, or methoxy;
• R2 is H or OH;
• each R3 is independently C1-6alkyl;
• X is CH2, C(O), or CH═CH;
• Q is C0-6alkyl;
• R4 is OH, SO3H, CO2H, PO3H2, CONR5R5, NR5R5;
• or NHC(O)CH2NR5R5;
• each R5 is independently H, OH, C1-6alkyl, C0-6alkylCO2H, C0-6 alkylSO3H, C0-6alkylPO3H2, C(O)C0-6alkylCO2H, C(O)C0-6alkylSO3H, C(O)C0-6alkylPO3H2, or CH(R7)C0-6alkyCO2H;
• and
• R7 is C0-6alkylCO2H, C0-6alkylOH, C0-6alkylSO3H, or C0-6alkylPO3H2.