Patent ID: 7547697

Claim:
A compound of formula (I): wherein R 1 is cycloalkyl, arylalkyl or aryloxyalkyl; R 1 is cycloalkyl, arylalkyl or aryloxyalkyl; or R 1 and R 2 together with the carbon atoms C a and C b to which they are attached form R 3 is hydrogen, alkyl, cycloalkyl or trifluoromethyl; R 4 is 2,2-dimethyl-propyl, 3-methyl-butyl, iso-propyl, tert-butyl, cyclopropylmethyl, cyclopentylmethyl, 3,3-dimethyl-butyl or 1-cyclopropyl-1-methyl-ethyl; R 5 is hydrogen, alkyl cycloalkyl or alkoxy; R 6 is hydrogen, alkyl, cycloalkyl or alkoxy; R 7 is hydrogen, alkyl, cycloalkyl or alkoxy; and pharmaceutically acceptable salts thereof.