The structure for dipropyl ether is: 
Definitions:
Moral Duty
An obligation to act in a way considered morally right, often based on societal norms, ethical principles, or personal beliefs.
Tristram Engelhardt Jr.
An American philosopher known for his contributions to bioethics, emphasizing the moral pluralism and conflicts in modern healthcare.
Prolong
To extend the duration of something, making it last longer than normal or intended.
Eduard Verhagen
A person associated with medical ethics, possibly known for his contribution to the field, but requires further context for a precise definition.
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