L-Glu(Otbu) -Otbu-OH

Ana yin Ester ne daga halayen inorganic acid ko Organic acid ko barasa.Barasa ko phenol ko acidic anhydride, barasa da ethylene, free acidic acid da fatty nitrogen da aka samu suma na iya samar da ester.Hydrogen akan alpha-carbon a cikin kwayoyin ester yana rasa barasa na kwayoyin halitta tare da wani ester kwayoyin halitta a karkashin yanayin alkaline don samar da β-keto ester, wanda ake kira ester contraction reaction.Alal misali, acetyl acetate an samar da shi don samar da acetyl ethyl acetate.Wannan halayen yana da mahimmanci sosai a cikin haɗin kwayoyin halitta.

Sunan ester ya fito ne daga daidai sunan carboxylic acid da barasa ko phenol, kamar "wani acid da wani ester".Ana kiran esters da'ira lactone (lactone).Abubuwan sinadarai na ester sun yi kama da amyl niche anhydride, wanda ke da haɗari ga hydrolysis, barasa da ammoniya.Low-grade ester mai ƙamshi ne kuma ruwa mara launi, kuma ester ci gaba yana da ƙarfi.Estes sune mahimman kaushi da kayan daɗaɗɗen roba, kuma wasu esters sune kwayoyi da kansu.Dangane da nau'in acid, ana iya raba ester zuwa inorganic acid ester da Organic acid ester.Etate, ethyl acetate shine m ester, acetate shine ester aromatic, kuma namanonate shine ester cyclic.