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