wherein {HEAD ~ R1} is hydrogen, {TAIL ~ fluoro}, chloro, or methyl; and R2 is C4 CS branched alkyl 
is
wherein { HEAD ~ R1 } is hydrogen , { TAIL ~ fluoro } , chloro , or methyl ; and R2 is C4 CS branched alkyl
OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH