Y is a phenyl group which may be optionally mono , di , or tri substituted with {HEAD ~ a group} selected from alkyl of 1 6 carbon atoms, aralkyl of 7 10 carbon atoms, {TAIL ~ alkoxy} of 1 6 carbon atoms, cyano, halo, nitro, carbalkoxy of 2 7 carbon atoms, trifluoromethyl, dialkylamino of 1 6 carbon atoms per alkyl group, alkylthio of 1 6 carbon atoms, SO3 H, PO3 H, or CO2 H 
Y is a phenyl group which may be optionally mono , di , or tri substituted with { HEAD ~ a group } selected from alkyl of 1 6 carbon atoms , aralkyl of 7 10 carbon atoms , { TAIL ~ alkoxy } of 1 6 carbon atoms , cyano , halo , nitro , carbalkoxy of 2 7 carbon atoms , trifluoromethyl , dialkylamino of 1 6 carbon atoms per alkyl group , alkylthio of 1 6 carbon atoms , SO3 H , PO3 H , or CO2 H
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH