Patent ID: 8754228

Claim:
A compound of formula (I), wherein: X is CH, N or S; n is 0 or 1; R 1 is hydrogen, acyl, alkyl, halogen, alkoxy, aldehyde, hydroxy, cyano, nitro, amino, aryl, heteroaryl or heterocyclyl; R 2 is hydrogen, acyl, alkyl, halogen, alkoxy, aldehyde, hydroxy, cyano, nitro, amino, aryl, heteroaryl or heterocyclyl; or salt thereof; R 3 is hydrogen, acyl, alkyl, halogen, alkoxy, aldehyde, hydroxy, cyano, nitro, amino, aryl, heteroaryl or heterocyclyl and wherein R 2 and R 3 may be joined together to form a cycylic ring such as aryl, heteroaryl or heterocyclic.