Various derivatives of DTPA , including those disclosed herein, are preferred chelators for such ions in {HEAD ~ compounds} according to {TAIL ~ the present invention} 
according to
Various derivatives of DTPA , including those disclosed herein , are preferred chelators for such ions in { HEAD ~ compounds } according to { TAIL ~ the present invention }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL