Which portion of the chemical structure of a typical local anesthetic is considered lipophilic (lipid soluble)?

Question

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The aromatic nucleus of the local anesthetic contains no positive or negative charges.This feature allows it to mix with and pass through lipid environments,such as the plasma membrane of a nerve cell.The amino group is considered water soluble or hydrophilic.At a certain pH,it can gain a charge,which will enhance its solubility in water and prohibit its solubility in lipids.

Which Portion of the Chemical Structure of a Typical Local