These competing interests, after more than eight weeks of negotiations, finally produced a compromise treaty. Several controls were watered down; for instance, the proposed mandatory embargoes on nations failing to comply with the treaty became recommendatory. The 1953 New York Opium Protocol, which had not yet entered into force, limited opium production to seven countries; the Single Convention lifted that restriction, but instituted other regulations and put the International Narcotics Control Board in charge of monitoring their enforcement. A compromise was also struck that allowed heroin and some other drugs classified as particularly dangerous to escape absolute prohibition.