The compound 1 wherein R1 and R2 are phenyl and R3, R4 and R5 are {HEAD ~ each} independently {TAIL ~ a lower alkyl} 
independently
The compound 1 wherein R1 and R2 are phenyl and R3 , R4 and R5 are { HEAD ~ each } independently { TAIL ~ a lower alkyl }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL