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In this study, we characterized the magnetic interactions in a tetraradical consisting of two localized 1,3\u2010diradical units connected by <jats:italic>p<\/jats:italic>\u2010quaterphenyl within a curved CPP skeleton by electron paramagnetic resonance (EPR) spectroscopy and quantum chemical calculations. Persistent triplet species with zero\u2010field splitting parameters similar to those of a triplet 1,3\u2010diphenylcyclopentane\u20101,3\u2010diyl diradical were observed by continuous wave (CW) or pulsed X\u2010band EPR measurements. The quintet state derived from the ferromagnetic interaction between the two triplet diradical moieties was not detected at 20\u2005K under glassy matrix conditions. At the B3LYP\/6\u201031G(d) level of theory, the singlet state was lower in energy than the triplet and quintet states. 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