Bicarbocyclic and tricarbocyclic ethynyl derivatives and uses of same

1) A compound of formula (I):

• wherein:
• R1 and R2 are independently aryl, heteroaryl, heterocyclyl which is optionally mono-, di-, or tri-substituted independently with alkyl, halogen, hydroxy, cyano, amino, alkylamino, dialkylamino, acyl, aryl, heteroaryl, heterocyclyl, cycloalkyl, ketocycloalkyl, alkoxy, hydroxylalkyl, trifluoromethyl;
• and
• When n=0 and 1, X and Y are H;
• and
• When n=1, both X and Y are bonds that are linked to —CH2— to form a tricyclic adamantyl core;