The CAS number for Lidocaine Base (pure, non-salt form) is 137-58-6. This compound, often used as a local anesthetic and antiarrhythmic agent, is chemically known as 2-(diethylamino)-N-(2,6-dimethylphenyl)acetamide. It is commonly used for topical applications and in compounded creams, distinguishable from the water-soluble Lidocaine Hydrochloride (CAS 73-78-9).

National Institutes of Health (.gov)

National Institutes of Health (.gov)

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CAS Number: 137-58-6

Formula:

Molecular Weight: 234.34 g/mol

Appearance: White to off-white crystalline powder

Solubility: Poorly soluble in water; soluble in organic solvents like alcohol, ether, and chloroform.