A voltage generation circuit of the invention applied for a non-volatile semiconductor memory device has a memory cell array including multiple non-volatile memory elements. A semiconductor chip is interposed between the upright clips together with one or more spacers. The adjusting unit further has adjusting blocks formed on the other one of the first barrel and the first frame and engaging respectively and slidably the adjusting grooves. Furthermore, a control parameter is changed depending on the range to which the calculated motor parameter is allocated to provide an optimised control parameter such that the control parameter is changed beginning from a starting value specified for the respective range of the motor size until a predetermined criterion for a specific motor size is reached. The gripper of the first arm and the gripper of the second arm are configured to grip an external object. Antioxidant prodrugs of the invention are produced by modifying an antioxidant to a fatty acid so that the resulting prodrug is targeted to and activated by an enzyme of mitochondrial fatty acid beta-oxidation.