The reaction of a compound of {TAIL ~ formula IV} with a compound of {HEAD ~ formula V} in accordance with process variant can be carried out in a manner known per se 
The reaction of a compound of { TAIL ~ formula IV } with a compound of { HEAD ~ formula V } in accordance with process variant can be carried out in a manner known per se
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH