The present invention is directed to polymeric- prodrug transport forms of the formula: wherein: B is a leaving group, OH, a residue of a hydroxyl-containing moiety or wherein B1 is a leaving group, OH or a residue of a hydroxyl-containing moiety Y1-2 are independently O or S M is selected from either X or Q wherein X is an electron withdrawing group and Q is a moiety containing a free electron pair positioned three to six atoms from C(=Y2) R2-5 are independently selected from the group consisting of hydrogen, C1-6 alkyls, C3-12 branched alkyls, C3-8 cycloalkyls, C1-6 substituted alkyls, C3-8 substituted cycloalkyls, aryls, substituted aryls, aralkyls, C1-6 heteroalkyls and substituted C1-6 heteroalkyls (m) is zero or one (n) is a positive integer (p) is zero or a positive integer Z is an electron withdrawing group and R1 is a polymeric residue which is optionally capped with a moiety of the Formula (v)
