World powers and Iran have reached tentative agreement on sanctions relief for the Islamic Republic, among the most contentious issues in a long-term nuclear agreement that negotiators hope to clinch over the next several days, diplomats told The Associated Press ysterday.

The annex hammered out by experts, one of five meant to accompany the agreement, outlines which U.S. and international sanctions will be lifted and how quickly. Diplomats said senior officials of the seven-nation talks, which include U.S. Secretary of State John Kerry and Iranian Foreign Minister Mohammad Javad Zarif, still had to sign off on the package.

Still, the word of significant progress indicated the sides were moving closer to a comprehensive accord that would set a decade of restrictions on Tehran’s nuclear program in exchange for tens of billions of dollars’ in economic benefits for the Iranians.