R1 =CO2 R3 ; P2 ; P ; SO3 R3 ; or {HEAD ~ CONHR3} in {TAIL ~ any combination} 
R1 = CO2 R3 ; P2 ; P ; SO3 R3 ; or { HEAD ~ CONHR3 } in { TAIL ~ any combination }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL