| abstract |
There is provided compounds of formula (I), wherein R1 represents C¿3-5? alkyl; and R?2 and R3¿ independently represent C¿1-3? alkyl; provided that when R?2 and R3¿ both represent ethyl, then R1 does not represent n-butyl, i-butyl or n-pentyl; or a pharmaceutically acceptable salt thereof, which are useful as anaesthetics, in particular local anaesthetics and especially topically applied local anaesthetics. |