73622-94-3 Acetic acid, hexachloro-, dianhydride with N,N'-vinylene dicarbamic acid Acetic acid, trichloro-, dianhydride with 1,2-ethenediylbis(carbamic acid) (9CI) BRN 2020437 CARBAMIC ACID, N,N'-VINYLENEDI-, DIANHYDRIDE with TRICHLOROACETIC ACID N,N'-Vinylenebis(trichloroacetic acid carbamic acid anhydride) NSC 221221