1,1,1-trichloro-4-ethoxybut-3-en-2-one 3-buten-2-one, 1,1,1-trichloro-4-ethoxy- InChI=1/C6H7Cl3O2/c1-2-11-4-3-5(10)6(7,8)9/h3-4H,2H2,1H3/b4-3