In some cases, multiple reaction pathways are possible in a complex cycloaddition reaction. The presence of alternative pathways can result in changes in diastereoselectivity, especially if the new pathway becomes more favorable under different conditions.
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L-Tyrosine, 3-Methoxy-O-Methyl-, ethyl ester
2-(adamantan-1-yl)-1-(4-methoxyphenyl)ethan-1-one
