Prof. Matsumoto attended Pacifichem 2025 (Dec. 17-20, Honolulu, Hawai) and presented our research progress at two symposia. One presentation is “Intermolecular structures of jet-cooled molecular large clusters in gas-phase studied by two-dimensional correlation infrared spectroscopy” at the symposium “Horizon of 2D Correlation Spectroscopy”. The other presentation is “Chirality recognition of propylene oxide dimer induced by hydrogen bond with pyrrole as an achiral tag” at the symposium “Synergy of Theory and Experiments in Exploring Molecular Functionality in Supramolecules and Molecular Clusters in the Gas Phase”.