Roth IRA distribution

I took the full amount of a Roth IRA. The 1099-R shows the full amount, base and interest in box 1. Box 2 is blank. Both boxes in 2b are checked. The distribution code is T. 

What is the best suggestion for entering the info so that I am only taxed on the interest? Using only the info on the form causes the whole thing to be taxed.