The primary class of {HEAD ~ compounds} employed are ethylene oxide derivatives, nonionic polysaccharides and under certain specified conditions {TAIL ~ anionic polysaccharides} 
The primary class of { HEAD ~ compounds } employed are ethylene oxide derivatives , nonionic polysaccharides and under certain specified conditions { TAIL ~ anionic polysaccharides }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL