C30H17Cl

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C30H17Cl is a chemical formula for any molecule that has 30 carbon atoms, 17 hydrogen atoms, and one chlorine atom. Its molar mass is about 412.91 g/mol. But this formula can describe many different structures; these are called isomers. Most of these forms are large, ring-based molecules built from fused aromatic rings with a single chlorine substituent. To identify a specific compound, you would need more details such as a structural diagram, an IUPAC name, or spectral data.