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Medical

Which compound amongst the following is not an aromatic compound? [Diagram: Four cyclic organic compounds are shown. (1) Five-membered ring with a positive charge. (2) Six-membered ring with a positive charge. (3) Four-membered ring with a positive charge. (4) Eight-membered ring with a double bond. This structure is non-planar.]

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Which of the following is the least likely to be involved in stabilizing the three-dimensional folding of most proteins?

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