Draw the alkyl bromide(s) you would use in a malonic ester synthesis of ethyl 3-methylbutanoate. You do not have to consider stereochemistry. If no reaction occurs, draw ethyl 3-methylbutanoate. If more than one alkyl bromide is needed, draw them all. Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. Separate structures with signs from the drop-down menu.