Ethyl group

In organic chemistry, an ethyl group (abbreviated as ET, Et or et) is an alkyl substituent with the formula −CH2CH3, derived from ethane (C2H6).

Ethyl is used in the International Union of Pure and Applied Chemistry's nomenclature of organic chemistry for a saturated two-carbon moiety in a molecule, while the prefix "eth-" is used to indicate the presence of two carbon atoms in the molecule.