The present invention refers to a process for the separation of regioisomeric mixtures of metal phthalocyanines of formula, to the regioisomers obtained by this process, and their use as phototherapeutic and photodiagnostic agents. The seat back has a cushion that supports an occupant. When the hypervisor receives the request for data, the hypervisor returns a taskID that identifies the task allocated to handle the request.