R25 is hydrogen, alkyl of 1 6 carbon atoms, or {TAIL ~ aralkyl} of {HEAD ~ 7 10 carbon atoms} 
R25 is hydrogen , alkyl of 1 6 carbon atoms , or { TAIL ~ aralkyl } of { HEAD ~ 7 10 carbon atoms }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD