A compound magnetic data storage cell, applicable to spin-torque random access memory, is disclosed. A plurality of stator members is arranged along and spaced from the circumference of the rotor. The compound of the present invention can be used as an agent for treating andor an agent for preventing diseases associated with 17\u03b2HSD type 5, such as benign prostatic hyperplasia and prostate cancer, without accompanying adverse effects due to a decrease in testosterone. The cooling is coordinated with the application of the laser beam so as to control the temperatures of all affected layers of tissues.