This invention features a compound of the following formula:
T-(-L-C).sub.m,
T is a transportophore, L is a bond or a linker having a molecular weight
up to 240 dalton, C is a non-antibiotic therapeutic agent, and m is 1, 2,
3, 4, 5, 6, 7, or 8, in which the transportophore has an immune
selectivity ratio of at least 2, the transportophore is covalently bonded
to the non-antibiotic therapeutic agent via the bond or the linker, and
the compound has an immune selectivity ratio of at least 2.
