A proceeding to request an interpretation is commenced by the filing of a “Request for Interpretation (FUA).” The request must be in writing and must also comply with the general filing requirements stated in §501.7. Any claims for confidential treatment for any information contained in the request or other related documents must be made pursuant to §501.7(a)(11). A request for interpretation should be filed with the Assistant General Counsel for Interpretations and Rulings at the address provided in §501.11.