Patent ID: 7064203

Claim:
A compound of formula I wherein the symbols have the following meanings and are, for each occurrence, independently selected: R 1 and R 2 are independently aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclo or substituted heterocyclo; R 3 and R 4 are independently hydrogen, alkyl, substituted alkyl, halogen, alkoxy, substituted alkoxy, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocyclo, substituted heterocyclo, alkylheterocyclo, substituted alkylheterocyclo, —O-heterocyclo or —NHCOOalkylheterocyclo; R 5 and R 5a are hydrogen, alkyl, substituted alkyl or halogen, X is —O— or NR 5 ; n is 1 or 2; or a pharmaceutically acceptable salt or stereoisomer thereof.