What type of compound has been used to replace tetraethyl lead ((C₂H₅)₄Pb)as an antiknock agent in gasoline?

Name: What type of compound has been used to replace tetraethyl lead ((C 2 H 5 ) 4 Pb)as an antiknock agent in gasoline?
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Oxygenated hydrocarbons, such as ethanol and MTBE (methyl tertiary-butyl ether), have been used as replacements for tetraethyl lead in gasoline as antiknock agents. These compounds are less harmful to the environment and human health compared to lead compounds.

What Type of Compound Has Been Used to Replace Tetraethyl