Yes, yes.
There's no question that sanctions have hurt Iran very badly, despite the benefits to the Revolutionary Guards, which we talked about in the context of the previous question. I don't think there's any question that this has pushed Iran into negotiations.
The problem is that today the situation has changed. Iran has been able to develop what they call a resistance economy that allows them to avoid sanctions. Iran trades with Asian countries, not only with China, but also with semi-allies like Malaysia, for example. Iran has diversified its trade considerably and is much more resistant to sanctions than it was in the past. This limits the effectiveness of sanctions.