Preheat oven to 325 degrees F (165 degrees C). Grease and flour a 10-inch bundt pan.
Beat butter and sugar together in a large bowl with an electric mixer until light and fluffy. Beat one egg at a time into the butter mixture; add lemon extract with last egg.
Sift together the flour, baking soda and salt. Alternately mix in the flour mixture and the yogurt, starting and ending with the dry ingredients. Beat just until incorporated.
Pour batter into prepared pan. Bake in the preheated oven for 60 minutes, or until a toothpick inserted into the center of the cake comes out clean. Allow to cool 10 minutes in the pan, then turn out onto a wire rack and cool completely.
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