{HEAD ~ The solvent} can be selected from {TAIL ~ ketones}, esters, cyclic ethers and other kinds of polar solvents and may be a mixed solvent 
{ HEAD ~ The solvent } can be selected from { TAIL ~ ketones } , esters , cyclic ethers and other kinds of polar solvents and may be a mixed solvent
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH