It may still be illegal for most U.S. and European businesses to do business in Iran, but it’s not premature for their lawyers to begin dissecting the nuclear deal that was announced earlier this month. If approved by Congress, some of the sanctions and compliance rules that have stifled the Iranian economy for years will be loosened.

Partners at Am Law 100 firms say their clients are inquiring about whether the accord, reached between Iran and six world powers, including the U.S., means that they will soon have access to the large and developed Iran economy.