provided that at least one of R3, R6 or {TAIL ~ R8} is {HEAD ~ SO3 X}; and 
provided that at least one of R3 , R6 or { TAIL ~ R8 } is { HEAD ~ SO3 X } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH