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"The correct title of this article is Vinylcyclopropane [5+2] cycloaddition. The substitution of any brackets is due to technical restrictions."
No, the correct title of the article is with round brackets. Square bracket always refer to the number of pi electrons, so in this case it's [4+2], whereas round bracket refer to the atoms in the system, (5+2). All the article body is to be corrected.