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