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