(D) Petitioner’s brief The petitioner shall serve and file a brief in connection with a petition for judicial review not later than 40 days after the date on which the administrative record is available, and may serve and file a reply brief not later than 14 days after service of the brief of the respondent, and the court may not extend these deadlines, except for good cause shown. If a petitioner fails to file a brief within the time provided in this paragraph, the court shall dismiss the appeal unless a manifest injustice would result. (E) Scope and standard for review The court of appeals shall conduct a de novo review of the administrative record on which the final determination was based and any additional evidence that the Court finds was previously unavailable at the time of the administrative hearing. (F) Exhaustion of administrative remedies A court may review a final determination under paragraph (3)(C) only if— (i) the petitioner has exhausted all administrative remedies available to the petitioner as of right, including any administrative remedies established by regulation, and (ii) another court has not decided the validity of the order, unless the reviewing court finds that the petition presents grounds that could not have been presented in the prior judicial proceeding or that the remedy provided by the prior proceeding was inadequate or ineffective to test the validity of the order. (G) Enforcement of orders If the final determination issued against the employer under this subsection is not subjected to review as provided in this paragraph, the Attorney General, upon request by the Secretary, may bring a civil action to enforce compliance with the final determination in any appropriate district court of the United States. The court, on a proper showing, shall issue a temporary restraining order or a preliminary or permanent injunction requiring that the employer comply with the final determination issued against that employer under this subsection. In any such civil action, the validity and