AFR/Protest No. 5301-03-100238; Phillips Petroleum Company; 19 C.F.R. § 174.24 and 174.25; 19 U.S.C. § 1313(j)(2); Cyclohexane; commercial interchangeability; Texport Oil Co. v. United States, 185 F. 3d 1291, 1295 (Fed. Cir. 1999); HQ 230165 (June 4, 2004); HQ 228211(Aug. 4, 1999); HQ 227537 (April 9, 1999)