R and T are the same or different, being hydrogen, a hydrocarbyl group having from 1 to 12 carbon atoms, or {HEAD ~ a 1 to 6 heteroatom substituted hydrocarbyl group} having from {TAIL ~ 1 to 12 carbon atoms}, wherein said heteroatoms are chalcogen, halogen, or nitrogen 
having from
R and T are the same or different , being hydrogen , a hydrocarbyl group having from 1 to 12 carbon atoms , or { HEAD ~ a 1 to 6 heteroatom substituted hydrocarbyl group } having from { TAIL ~ 1 to 12 carbon atoms } , wherein said heteroatoms are chalcogen , halogen , or nitrogen
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH