Which of the following structures contains a secondary amine? 
Definitions:
Groundwater Supplies
Underground sources of fresh water stored in aquifers, crucial for drinking water, irrigation, and industrial uses.
Sulphur Content
The quantity of sulfur present in a material, which is significant in assessing air pollution potential, especially in fuels.
Crude Oil Reserves
Quantities of crude oil that are identified and accessible for extraction with current technology.
Arctic National Wildlife Refuge
A protected area in Alaska, United States, known for its natural beauty, diverse wildlife, and ongoing debates over oil exploration.
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