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Page 7; para 2; line 44-51: Authors have reported the"head-to-head"cycloaddition to generate 2, using the MS fragmentation pattern based on
previously reported study in Tetrahedron, 2013, 69, 11074¨C11079. This reviewer believes that the structure can be logically better explained using the tell-tale presence and absence of plausible masses in the scenario of head to head mode. Please expand/explain


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