For 10 points, name these fleeting structures produced during chemical reactions.
Ahmed Zewail observed these structures using lasers in a new field of study he dubbed femtochemistry. Oseltamivir, or Tamiflu, is an example of an inhibitor that works by mimicking this kind of structure. The Eyring equation was developed out of the theory of this name. This structure has a trigonal bipyramidal geometry in the SN2 reaction. This structure's appearance depends on the species closest to it in free energy, according to Hammond's postulate. Activated complexes are similar to these structures, which are denoted by a double dagger symbol. This structure corresponds to the highest potential energy along the reaction coordinate. For 10 points, name these fleeting structures produced during chemical reactions.
Ahmed Zewail observed these structures using lasers in a new field of study he dubbed femtochemistry.
transition states [accept activated complexes before mentioned]