As used herein, {HEAD ~ “alkyl” groups} include straight chain and branched {TAIL ~ alkyl groups} having from 1 to about 20 carbon atoms, and typically from 1 to 12 carbons or, in some embodiments, from 1 to 8 carbon atoms 
As used herein , { HEAD ~ “ alkyl ” groups } include straight chain and branched { TAIL ~ alkyl groups } having from 1 to about 20 carbon atoms , and typically from 1 to 12 carbons or , in some embodiments , from 1 to 8 carbon atoms
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH