Which of the following compounds contain an anhydride functional group? 
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Financial contracts obligating the buyer to purchase an asset or the seller to sell an asset, such as a physical commodity or a financial instrument, at a predetermined future date and price, specifically for the month of July.
Silver
A precious metal with the chemical element symbol Ag, used in jewelry, currency, and industrial applications.
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A stock market index that measures the stock performance of 500 large companies listed on stock exchanges in the United States.
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A futures contract with a delivery or settlement date in December.
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