${\text{CH}}_3{\text{COOCH}}_2{\text{CH}}_3$ is the formula of ________.

The given chemical formula ${\text{CH}}_3{\text{COOCH}}_2{\text{CH}}_3$ represents an ester.
* The alkyl group attached to the oxygen atom is an ethyl group ($-{\text{CH}}_2{\text{CH}}_3$).
* The acyl part derived from carboxylic acid contains two carbon atoms (${\text{CH}}_3\text{COO}-$), corresponding to ethanoate (acetate).
Combining these parts according to IUPAC nomenclature gives Ethyl ethanoate (commonly known as ethyl acetate).