Water soluble macromolecular prodrugs, their preparation and {HEAD ~ their use} as {TAIL ~ antitumor and antiparasite medicines} 
as
Water soluble macromolecular prodrugs , their preparation and { HEAD ~ their use } as { TAIL ~ antitumor and antiparasite medicines }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL