After two rounds of negotiations, Iran's top nuclear negotiator said Sunday the chance of a nuclear compromise being reached with European nations stands at about 50 percent and ruled out any indefinite suspension of key nuclear enrichment activities. "I see the chance of a compromise before November as 50-50," top nuclear negotiator Hossein Mousavian told The Associated Press in an exclusive interview Sunday. At the talks in Vienna, Austria, the key three European powers (Britain, Germany and France) offered Iran a trade deal and peaceful nuclear technology _ including a light-water research reactor _ in return for assurances that the country will stop uranium enrichment indefinitely. "We have rejected two possibilities: cessation and unlimited suspension," said Mousavian, Iran's chief delegate to the IAEA. "We told the Europeans if your target is cessation, it will be impossible. But we are flexible if your proposal is balanced," he said.