DRL shall keep, and cause its Affiliates to keep, complete, true and accurate books of accounts and records for the purpose of determining the amounts payable to XenoPort pursuant to this Agreement. Such books and records shall be kept for [ * ] . Such records will be open for inspection during [ * ] , by an independent auditor chosen by [ * ] for the purpose of verifying the amounts payable by DRL hereunder. Such inspections may be made [ * ] , at reasonable times and [ * ] written notice. Such records [ * ] shall be subject to [ * ] . The independent auditor from the audit firm of international repute [ * ] , shall be obligated to execute a reasonable confidentiality agreement prior to commencing any such inspection. Inspections conducted under this Section 7.4 shall be at the expense of [ * ] , unless a variation or error producing [ * ] for a period covered by the inspection is established, in which case all reasonable costs relating to the inspection for such period and any [ * ] amounts that are discovered shall be paid by [ * ] , together with interest on such [ * ] amounts at the rate set forth in Section 7.1 above. If the audit establishes that [ * ] period covered by the audit, then such [ * ] amount shall be credited against [ * ] under this Agreement after the completion of the audit. The Parties will endeavor in such inspection to minimize disruption of DRL’s normal business activities to the extent reasonably practicable.