Sentence:  Two absorptions of * * f with <WSD>ethyl</WSD> acetate or two absorptions of * * f ( which had been passed through Dowex-2-chloride ) , NS and * * f with crown gall tissue powder , or mouse liver powder did not further improve the specificity of staining . 
Meaning of the word marked with <WSD> tags:  a fragrant colorless flammable volatile liquid ester made from ethanol and acetic acid; used in flavorings and perfumes and as a solvent for plastics