| abstract |
The present invention provides methods and compositions for use in the treatment, prevention and / or alleviation of drug abuse and / or symptoms thereof. In particular, the invention relates to a compound of formula I: or a pharmaceutically acceptable salt thereof, wherein each of R 1 , R 2 , R 3 , Ar, y and n is as defined herein. Demonstrates that the composition comprising (which is significant) is useful in such treatment, prevention and / or alleviation. |