Patent ID: 6969725

Claim:
An optically active compound of formula (I) wherein R 1 is aryl; R 2 is lower-alkyl, or fluoro-lower-alkyl; R 3 and R 4 independently from each other are hydrogen, hydroxy, halogen, lower-alkyl, fluoro-lower-alkyl, hydroxy-lower-alkyl, lower-alkoxy-lower-alkyl, lower-alkoxy, fluoro-lower-alkoxy, hydroxy-lower-alkoxy, lower-alkoxy-lower-alkoxy, or lower-alkenyl, wherein at least one of R 3 and R 4 is not hydrogen; R 5 is lower-alkoxy, fluoro-lower-alkoxy, fluoro-lower-alkenyloxy, aryloxy, aryl-lower-alkoxy, or aryl-fluoro-lower-alkoxy; R 6 is hydrogen or lower-alkyl; n is 1; or pharmaceutically acceptable salts and/or pharmaceutically acceptable esters thereof.