hageneriksson's assessment sounds correct in reviewing it. the guarantee buy appears to be after the 4 yr period...but either way...I don't think we will see no purchases in that period. Also says that there are other parts that will remain confidential. That will play into the favor of knocking out Sanofi competition with how they want this to market against the generics. I think we have something here.
whatever you want to call it - actually there are 4 years in which Sanofi isn't obligated to buy anything from the company - and the 150 million number after that time is just to remain the sole purchaser.
this means it is all up to Sanofi with UNIS taking the back seat here - if the program isn't successful they don't need to purchase anything