Which of the following substrates cannot be used as an immediate precursor to synthesize an ester? 
Definitions:
Respiratory
Pertaining to or serving for respiration, which is the process of inhaling oxygen and exhaling carbon dioxide.
Chronic Obstructive Pulmonary Disease
A long-term inflammatory lung disease that causes obstructed airflow from the lungs, involving conditions such as emphysema and chronic bronchitis.
Frequent Infection
An increased occurrence of infections, indicating a possible immune system deficiency.
Wheezing
A high-pitched whistling sound made while breathing, often indicating a respiratory condition such as asthma.
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