reuters.com:

"If Iran truly wants to resolve its differences with the international community -- and facilitate the lifting of economic sanctions -- it will have no better chance than between now and November 24," she added.

"This is the time to finish the job."

It is unclear whether the deadline, which has already been extended once, from July 20, will be met.

Sherman suggested there may have been an inordinate focus on the number and quality of centrifuges that Iran might be allowed to spin under any comprehensive deal, saying the negotiation "is a puzzle with many interlocking pieces."

She argued that "the status quo" on Iran's uranium enrichment capacity was not acceptable because of the "thick cloud of doubt" cast by what she described as Tehran's past violations of the Nuclear Non proliferation Treaty, secret nuclear-weapons related activities and lack of transparency.

"The world will decide to suspend and then lift nuclear-related sanctions only if and when Iran takes convincing and verifiable steps to show that its nuclear program is and will remain entirely peaceful," she said. "That is a reasonable standard that Iran can readily meet."

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