1,1,1-trichloro-4-methoxypent-3-en-2-one 3-penten-2-one, 1,1,1-trichloro-4-methoxy- InChI=1/C6H7Cl3O2/c1-4(11-2)3-5(10)6(7,8)9/h3H,1-2H3/b4-3