New (3-alkoxy-phenoxy) -ethyl -dialkylamine derivatives and their use as topical anesthetics

摘要

There is provided a compound of formula (I), or a pharmaceutically acceptable salt thereof, useful as an anesthetic, in particular as a topical anesthetic and a topical local anesthetic.;(I);Wherein,;R ¹ represents C _3-5 alkyl,;R ² and R ³ independently represent C _1-3 alkyl,;When both R ² and R ³ represent ethyl, R ¹ represents n-butyl, i-butyl or n-pentyl;.