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Title
1,3-Dipolar cycloaddition reactions of nitrilimines with 1-aroyl-4,5-dihydro-3,4,4-trimethyl-5-methylene-1 H-pyrazoles. Synthesis of 6-aroyl-8,9,9-trimethyl-1,2,6,7-tetrazaspiro[4.4]nona-2,7-dienes.