{"data":{"id":"us/40-cfr-721.4140","jurisdiction":"us","citation":"40 CFR 721.4140","heading":"Hexachloronorbornadiene.","body":"(a) Chemical substance and significant new uses subject to reporting. (1) The chemical substance 1,2,3,4,7,7-hexachloronorbornadiene, CAS Number 3389-71-7, is subject to reporting under this section for the significant new use described in paragraph (a)(2) of this section.\n(2) The significant new use is: Use other than as an intermediate in the production of isodrin or endrin.\n(b) Specific requirements. The provisions of subpart A of this part apply to this section except as modified by this paragraph.\n(1) Definitions. In addition to the definitions in § 721.3, the following definitions apply:\n(i) “Endrin” means the pesticide 2,7:3,6-Dimethanonaphth[2,3-b]oxirene, 3,4,5,6,9,9-hexachloro-1a,2,2a,3,6,6a,7,7a-octahydro-, (1a alpha, 2beta,2abeta,3alpha,6alpha,6abeta, 7beta,7aalpha)-, CAS Number 72-20-8.\n(ii) “Isodrin” means the pesticide 1,4:5,8-Dimethano-naphthalene,1,2,3,4,10,10-hexachloro-1,4,4a,5,8,8a-hexahydro-, (1alpha, 4alpha, 4abeta, 5beta, 8beta, 8abeta)-, CAS Number 465-73-6.\n(2) [Reserved]","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER R—TOXIC SUBSTANCES CONTROL ACT","PART 721—SIGNIFICANT NEW USES OF CHEMICAL SUBSTANCES","Subpart E—Significant New Uses for Specific Chemical Substances"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"348ce45d379f2d1485fd7061cca372e93a8de413516d1a6ecec68fc09b714d2a","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-721.4136","next":"us/40-cfr-721.4155"},"notice":"GroundRules: Original legal text. Not legal advice."}