Combine all ingredients except syrup. Beat at low speed until blended. Beat at high speed 10 minutes. Combine one cup of batter with chocolate syrup. Set aside. Pour half of remaining batter in large tube pan that has been greased and floured. Spoon half of chocolate batter on top. Repeat layers and swirl batter with knife. Bake at 350 degrees for one hour or until done. If top begins to brown too much, cover loosely with foil.