R10 is independently selected from the group consisting of H, {TAIL ~ alkyl}, and {HEAD ~ arylalkyl} 
R10 is independently selected from the group consisting of H , { TAIL ~ alkyl } , and { HEAD ~ arylalkyl }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD