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