A compound given by general formula : . Mechanisms for reducing the number of transactions in a multiple cluster system are provided. The arm assembly of the second vessel is moved toward the pipe, until the pipe is secured, or disposed, therein. The wall side member having a plurality of pockets aligned with the plurality of slots. After this registration process is completed, calls may be placed to and from the wireless telephone in the roaming service area, and billing for those calls will be directed to the prepaid utilization account purchased by the user.