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