When “R1” and “R2” are respectively a hydrogen atom, there are {HEAD ~ many advantages} in {TAIL ~ water solubility} 
in
When “ R1 ” and “ R2 ” are respectively a hydrogen atom , there are { HEAD ~ many advantages } in { TAIL ~ water solubility }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL