R4 is H, CN, {HEAD ~ C1 C18 alkyl}, C1 C18 perfluoroalkyl, CH2 SO3 X; or {TAIL ~ L SC} ; wherein 
R4 is H , CN , { HEAD ~ C1 C18 alkyl } , C1 C18 perfluoroalkyl , CH2 SO3 X ; or { TAIL ~ L SC } ; wherein
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH