Synthesis and Characterization of Cycloocta[1,2-a:6,5-a′]diindene as an Octagon-Containing Nonalternant Isomer of Pentacyclic Benzenoid Aromatic Hydrocarbons with Hidden Diradical Character That Induces Dimerization - Akihito Konishi; Haruka Tokuyama; Hinaki Kitamura; Seiya Tsuchida; Mitsuharu Suzuki; Ken-ichi Nakayama; Ryohei Kishi; Makoto Yasuda (Journal of the American Chemical Society, 2025)