So we have a negative charge on this group. And the same thing is done with these two groups here. So because we're at 4.1, which is below seven, that means these will lose the H atom. And so we'll have a negative charge will exist in the form as shown on the board. And now what we have to do to find the net charge is we sum up all the charges. So we have a positive one, negative one, those cancel out, and then we have negative one and negative one.