The present invention provides a method for preparing astaxanthin from zeaxanthin. The compounds have useful pharmaceutical properties and are particularly active as iron chelators. In this case, a relatively long location registration period is set for the mobile terminal incorporated into a vending machine and having a weak mobility, as compared to the mobile terminal that frequently moves. The client includes a memory having an application and a data structure stored therein. In addition, an integrated control system is provided to automatically configure a fire truck’s interlock and shift pump operation. In one embodiment, the -2-methyl)cyclohexanone and transition-metal salt are in the form of a -2-methyl)cyclohexanone:transition-metal salt complex.