abstract |
The present invention relates to a compound of formula (I), a pharmaceutically acceptable salt thereof, or an isomer thereof, and a pharmaceutical composition for inhibiting beta secretase activity, which contains the same in a pharmacologically effective amount.n n n (I)n n n Wherein n, W, X, X ', Y, Z, R 1 , R 2 , R 3 and R 4 are as defined in the specification. |