Triethyl orthoacetate
Triethyl orthoacetate is the organic compound with the formula CH3C(OC2H5)3. It is the ethyl orthoester of acetic acid. It is a colorless oily liquid. Triethyl orthoacetate is used in organic synthesis for acetylation. It is also used in the Johnson-Claisen rearrangement. References

Orthoesters
Reagents for organic chemistry
Ethyl esters