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