A compound of formula or a pharmaceutically acceptable derivative thereof,wherein, R1, R2, R3, R4, R5, m, n and X are as defined in the specification; a process for preparing such compounds; a pharmaceutical composition comprising such compounds; and the use of such compounds in medicine. The liquid supply system supplies the immersion liquid during the immersion lithography process and supplies a cleaning liquid, which is different from the immersion liquid, during a cleanup process. The first layer generally forms the external back face surface of the case, the third layer generally forms the perimeter bumper of the case and the second layer forms the internal liner of the case and includes an elevated pattern of walls upon which the back face of the mobile device rest upon. The first, or Gap Vector Vg, defines the direction in which a first regulation movement of the axes of the machine must be performed to maintain the removal of material. The color misalignment correcting unit is further configured to weight the time information by using the corresponding weighting coefficient and perform color misalignment correction. Thus, cyclohexane 1,1-diacetic acid monoamide is first treated with NaOHNaClO to form 3,3-pentamethylenebutyrolactam, which is treated with aqueous HCl solution under reflux to provide gabapentin HCl salt, which is then neutralized with NaOH followed by a dehydration step to provide substantially pure, storage-stable, pharmaceutical grade gabapentin.