In {TAIL ~ other embodiments} of the invention, {HEAD ~ the active agent} comprises a paramagnetic element 
In
In { TAIL ~ other embodiments } of the invention , { HEAD ~ the active agent } comprises a paramagnetic element
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH