Which type of spectroscopy (IR, UV, or MS) will best distinguish between the pair of compounds below? Give a brief reason. 
Definitions:
Joint Venture
A business arrangement in which two or more parties agree to pool their resources for the purpose of accomplishing a specific task.
Licensing
The legal process by which a licensor grants the licensee the rights to use, produce, or sell its intellectual property in return for payment or royalties.
Direct Investment
The practice of purchasing a controlling interest in a foreign business or starting a new enterprise in a foreign country as a means of entering a market.
U.S. Products
Goods and services that are produced within the United States, reflecting the country's quality standards, regulations, and production capabilities.
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