31 C.F.R. § 560.420
For purposes of satisfying the de minimis content rule in § 560.205(b)(2):
Note 1 to § 560.420: Notwithstanding the exceptions contained in § 560.205(b)(1) and (b)(2) and this section, a reexportation to Iran or the Government of Iran of U.S.-origin items falling within the definition in § 560.205 is prohibited if those U.S.-origin goods (including software) or that technology have been substantially transformed or incorporated into a foreign-made end product which is destined to end uses or end users prohibited under regulations administered by other U.S. Government agencies. See, e.g., the Export Administration Regulations (31 CFR 736.2(b)(5), 744.2, 744.3, 744.4, 744.7, and 744.10); International Traffic in Arms Regulations (22 CFR 123.9).
Note 2 to § 560.420: A reexportation not prohibited by § 560.205 may nevertheless require authorization by the U.S. Department of Commerce, the U.S. Department of State or other agencies of the U.S. Government.
Note 3 to § 560.420: The provisions of § 560.205 and this section apply only to persons other than United States persons.