Azacycloalkane derivatives of structural formula I are selective inhibitors of stearoyl-coenzyme A delta-9 desaturase relative to other known stearoyl-coenzyme A desaturases. The cells extend in a longitudinal direction of the honeycomb structure. The rotor is slidably pressed against the stator. The magnetic random access memory of the invention includes a magnetoresistive film having the multilayer magnetic film as a memory element or the magnetization inversion mechanism as a writing unit.