A conjugate encompassed by a formula selected from the group consisting of: (i) wherein: R 1 is selected from the group consisting of H, halo, methyl, methoxy and trifluoromethyl; R 2 is selected from the group consisting of H and methyl; R 3 is selected from the group consisting of H, lower alkyl and amino; each n is a positive integer from 10 to about 400; q is 4; and lower alkyl is an alkyl group containing from 1 to 6 carbon atoms, and may be straight chain or branched, and pharmaceutically acceptable salts and solvates thereof; (ii) wherein: R 1 is selected from the group consisting of H, halo, methyl, methoxy and trifluoromethyl; R 2 is selected from the group consisting of H and methyl; R 3 is selected from the group consisting of H, lower alkyl and amino; each n is a positive integer from 10 to about 400; q is 4; and lower alkyl is an alkyl group containing from 1 to 6 carbon atoms, and may be straight chain or branched, and pharmaceutically acceptable salts and solvates thereof; and (iii) wherein: R 4 is selected from the group consisting of H, CH 3, CH(CH 3) 2, CH 2 CH(CH 3) 2 and C (CH 3)CH 2 CH 3; each n is a positive integer from 10 to about 400; and pharmaceutically acceptable salts and solvates thereof. (i) wherein: R 1 is selected from the group consisting of H, halo, methyl, methoxy and trifluoromethyl; R 2 is selected from the group consisting of H and methyl; R 3 is selected from the group consisting of H, lower alkyl and amino; each n is a positive integer from 10 to about 400; q is 4; and lower alkyl is an alkyl group containing from 1 to 6 carbon atoms, and may be straight chain or branched, and pharmaceutically acceptable salts and solvates thereof; R 1 is selected from the group consisting of H, halo, methyl, methoxy and trifluoromethyl; R 2 is selected from the group consisting of H and methyl; R 3 is selected from the group consisting of H, lower alkyl and amino; each n is a positive integer from 10 to about 400; q is 4; and lower alkyl is an alkyl group containing from 1 to 6 carbon atoms, and may be straight chain or branched, (ii) wherein: R 1 is selected from the group consisting of H, halo, methyl, methoxy and trifluoromethyl; R 2 is selected from the group consisting of H and methyl; R 3 is selected from the group consisting of H, lower alkyl and amino; each n is a positive integer from 10 to about 400; q is 4; and lower alkyl is an alkyl group containing from 1 to 6 carbon atoms, and may be straight chain or branched, and pharmaceutically acceptable salts and solvates thereof; and R 1 is selected from the group consisting of H, halo, methyl, methoxy and trifluoromethyl; R 2 is selected from the group consisting of H and methyl; R 3 is selected from the group consisting of H, lower alkyl and amino; each n is a positive integer from 10 to about 400; q is 4; and lower alkyl is an alkyl group containing from 1 to 6 carbon atoms, and may be straight chain or branched, (iii) wherein: R 4 is selected from the group consisting of H, CH 3, CH(CH 3) 2, CH 2 CH(CH 3) 2 and C (CH 3)CH 2 CH 3; each n is a positive integer from 10 to about 400; and pharmaceutically acceptable salts and solvates thereof. R 4 is selected from the group consisting of H, CH 3, CH(CH 3) 2, CH 2 CH(CH 3) 2 and C (CH 3)CH 2 CH 3; each n is a positive integer from 10 to about 400;