The starting material that completes the following reaction is 
Definitions:
Delegator
A person or entity that assigns tasks or duties to another party (the delegatee) while maintaining ultimate responsibility.
Obligation
A duty or commitment requiring an individual or entity to act in a certain way, often legally binding.
Duress
A situation where a person is compelled to perform an act or enter into a contract under threat of violence, harm, or undue pressure.
Doctrine
A system of principles or tenets adopted and propagated by a religious organization, political entity, or similar body.
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