Refers to a chemical reaction in which three atoms or groups are added to a molecule, followed by the addition of two more atoms or groups, resulting in the formation of a new ring structure.
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methyl 2-((tert-butoxycarbonyloxy)(o-tolyl)methyl)acrylate
3-(2-methylphenyl)butanoic acid
2-(2-thienyl)-3-(ethoxycarbonyl)-4-phenyl-1,5-diazabicyclo[3.3.0]oct-3-en-6-one
