Ƙirƙirar wani nau'i mai mahimmanci na wannan jumla A cikin ilmin sunadarai, esters sune sunadarai masu sinadaran da aka samo daga ƙuƙwalwar acid da barasa.
Tabbas, wani nau'i mai rikitarwa na jumla shine "A cikin ilmin sunadarai, esters sune mahaɗan sunadarai waɗanda aka samo daga acid inorganic ko acid na kwayoyin halitta wanda aƙalla ɗaya - OH (hydroxyl) rukuni an maye gurbin ta da - O - alkyl (alkoxy) rukuni. "