The following compound is prepared by Fischer esterification of which combination of reagents? 
Definitions:
Infertile
The inability to conceive children or young after a period of time, usually a year or more of regular sexual activity without contraception.
Down Syndrome
A genetic disorder caused by the presence of all or part of a third copy of chromosome 21, characterized by physical growth delays, characteristic facial features, and often intellectual disability.
Extra Chromosome
The presence of an additional chromosome in an individual's genetic makeup, which can result in developmental disorders such as Down syndrome.
21st Pair
Refers to the 21st pair of chromosomes in humans, which is critical for determining genetic conditions such as Down syndrome.
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