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