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Identify the catalyst used in the Fischer esterification reaction.
Substitute
An alternative or replacement for something else, often found or used when the original is unavailable or unsuitable.
Extend
To prolong the duration of something or to reach out in space or time.
Course of Dealing
A pattern of actions between parties that establishes a common basis for understanding in future transactions.
Usage of Trade
Established customs and practices in a particular industry that are considered binding or enforceable in business transactions.
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