Patent ID: 8119623

Claim:
A compound of formula (Ia) wherein R 1 is a hydrogen atom or an alkyl, alkenyl, alkynyl, heteroalkyl, aryl, heteroaryl, cycloalkyl, alkylcycloalkyl, heteroalkylcycloalkyl, heterocycloalkyl, aralkyl or heteroaralkyl radical; R 2 is a hydrogen atom or an alkyl, alkenyl, alkynyl, heteroalkyl, aryl, heteroaryl, cycloalkyl, alkylcycloalkyl, heteroalkylcycloalkyl, heterocycloalkyl, aralkyl or heteroaralkyl radical; R 3 is a hydrogen atom or an alkyl, alkenyl, alkynyl, heteroalkyl, aryl, heteroaryl, cycloalkyl, alkylcycloalkyl, heteroalkylcycloalkyl, heterocycloalkyl, aralkyl or heteroaralkyl radical; R 4 is a hydrogen atom or an alkyl, alkenyl, alkynyl, heteroalkyl, aryl, heteroaryl, cycloalkyl, alkylcycloalkyl, heteroalkylcycloalkyl, heterocycloalkyl, aralkyl or heteroaralkyl radical; R 5 is an alkyl, alkenyl, alkynyl, heteroalkyl, aryl, heteroaryl, cycloalkyl, alkylcycloalkyl, heteroalkylcycloalkyl, heterocycloalkyl, or heteroaralkyl radical; R 6 is a hydrogen atom or an alkyl, alkenyl, alkynyl, heteroalkyl, aryl, heteroaryl, cycloalkyl, alkylcycloalkyl, heteroalkylcycloalkyl, heterocycloalkyl, aralkyl or heteroaralkyl radical; or the radicals R 5 and R 6 together are part of an optionally substituted heterocycloalkyl, heteroalkylcycloalkyl, heteroaryl or heteroarylalkyl ring system, and/or R 2 and R 3 together are part of an optionally substituted cycloalkyl, alkylcycloalkyl, heterocycloalkyl, heteroalkylcycloalkyl, aralkyl or heteroaralkyl ring system; or a pharmaceutically acceptable salt, ester, or a pharmaceutically acceptable formulation thereof; with the exception of compounds: