What is another word for lead tetraethyl?
Pronunciation: [lˈiːd tˈɛtɹiːθˌa͡ɪl] (IPA) 
Lead tetraethyl is a clear, colorless liquid that is commonly used as an antiknock additive in gasoline. However, due to its toxic nature, the use of this substance has been banned in many countries. As an alternative, other compounds such as methylcyclopentadienyl manganese tricarbonyl (MMT) and ferrocene have been developed to serve as antiknock agents. MMT is a coordination compound that contains manganese and has a similar effect to lead tetraethyl. Ferrocene, on the other hand, is an organometallic compound that can increase the octane rating of gasoline without emitting harmful substances. These compounds provide a safer and more environmentally-friendly solution to lead tetraethyl.
