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