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