A process 2, wherein R1, R2 and R3 are hydrogen and {HEAD ~ R4} is {TAIL ~ a lower alkyl group} 
is
A process 2 , wherein R1 , R2 and R3 are hydrogen and { HEAD ~ R4 } is { TAIL ~ a lower alkyl group }
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 TAIL