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1-Ethylbenz[cd]indol-2(1H)-one is a specialized heterocyclic organic compound belonging to the indole family, characterized by a fused benzene ring system and an ethyl substituent at the nitrogen position. Its molecular formula is C14H11NO, corresponding to a precise molecular weight of approximately 209.24 g/mol. While specific commercial Catalog CAS numbers for this exact derivative may vary slightly depending on the manufacturer or synthesis pathway, it generally falls under the broader classification of substituted benzindoles used in advanced chemical research. This compound serves as a critical intermediate in the development of novel pharmaceutical agents, particularly within the fields of medicinal chemistry and oncology. Researchers frequently utilize such structures to explore structure-activity relationships (SAR) when designing kinase inhibitors or other bioactive molecules targeting specific cellular receptors. The presence of the ethyl group often enhances lipophilicity and metabolic stability compared to the parent indole structure, potentially improving membrane permeability in biological assays. Beyond pharmacological applications, derivatives of 1-ethylbenz[cd]indol-2-one are investigated for their potential utility in materials science, specifically as precursors for functional dyes or organic semiconductors due to their extended conjugated pi-systems. In laboratory settings, this substance is primarily handled as a high-purity reagent for synthetic organic chemistry, requiring standard safety precautions including the use of personal protective equipment and proper ventilation, as with most aromatic ketones. Its synthesis typically involves cyclization reactions followed by N-alkylation steps using ethylating agents. Although not a bulk commodity chemical, its niche role makes it invaluable for academic institutions and pharmaceutical R&D departments seeking to expand the library of nitrogen-containing heterocycles. Continued study of this molecule contributes significantly to the understanding of how subtle structural modifications influence biological efficacy and physicochemical properties in complex drug discovery pipelines.