2-cyclobuten-1-one, 4,4-dibromo-2-(2-bromoethyl)- 4,4-dibromo-2-(2-bromoethyl)cyclobut-2-en-1-one InChI=1/C6H5Br3O/c7-2-1-4-3-6(8,9)5(4)10/h3H,1-2H