2-butanone, 3-bromo-3-(1,3-dioxolan-2-yl)- 3-bromo-3-(1,3-dioxolan-2-yl)butan-2-one InChI=1/C7H11BrO3/c1-5(9)7(2,8)6-10-3-4-11-6/h6H,3-4H2,1-2H