Which reagents would be used in a Mannich reaction to synthesize 
Definitions:
Age
A measure of the length of time that an individual or object has existed, often expressed in years.
Change
The process or act of making or becoming different, which can occur in various contexts such as behavior, environment, or perception.
Cross-sectional Method
A research design that examines a group of individuals of different ages or stages at a single point in time.
Longitudinal Method
A developmental research method in which the same persons are observed repeatedly as they grow older; conceptually similar to a repeated measures design.
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