{HEAD ~ Suitable diamines} include triethylene glycol diamine and {TAIL ~ tetraethylene glycol diamine} , among others 
include
{ HEAD ~ Suitable diamines } include triethylene glycol diamine and { TAIL ~ tetraethylene glycol diamine } , among others
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH