A proprietary drug whose maker has said they will donate all 1.5 million doses that they currently have. That's more than they'll be able to produce over the next year (1 million) even after greatly increasing that production capacity.
That statement didn't clearly say whether they were going to donate those that they haven't produced yet. If they aren't donating that, this donation is like a ~10% discount (compared to the ~66% discount I had originally interpreted it in that case).