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This compound exhibits fluorescence intensities more than tenfold higher than those of most analogs, enabling its use at submicromolar concentrations with minimal perturbation of cellular function. Beyond this lead discovery, our results highlight a critical disconnect between photophysical properties in aqueous media and imaging efficiency in biological systems. By combining multiple analytical techniques, including photophysics, fluorescence microscopy, and flow cytometry as well as computational DFT calculations, we demonstrate that sterically hindered\n                    <jats:italic>N<\/jats:italic>\n                    \u2010substituents play a critical role by combining efficient cellular uptake and good solubility, two essential features that govern probe performance for cell imaging. These findings challenge the conventional reliance on intrinsic brightness as a design criterion and emphasize the necessity of integrating biological context into the evaluation and development of fluorescent imaging agents.\n                  <\/jats:p>","DOI":"10.1002\/cbic.70553","type":"journal-article","created":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T17:28:27Z","timestamp":1790702907000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Decoupling Photophysical Brightness and Cellular Imaging Efficiency in 4\u2010ANI\u2010Based Fluorophores: The Critical Role of Sterically Hindered\n                    <i>N<\/i>\n                    \u2010Substituents"],"prefix":"10.1002","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-4408-8280","authenticated-orcid":false,"given":"Laurane","family":"Michel","sequence":"first","affiliation":[{"name":"Institut de Chimie des Substances Naturelles 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