It’s unlikely, IMO, that BMY would ever have had to pay ZGEN all of the latter or any of the former.
Your opinion would be wrong. Approvals in three markets for HBV/HCV are likely to have taken up 90% of the milestones according to what we've been told. "Easily achievable" sales levels -- we believe $1.5B worldwide -- would have taken up all the sales milestones.
This ignores the other outlicensed products, preclinical pipeline, cash-flow positive RecoThrom, IL-21, and the 50% of lambda profits in NA and 15-18% royalties overseas.
Zymo's Board laid down on this one. It is a terrible, terrible deal.
It's also a moot point because between Warburg and Novo, BMY has 66% of the needed votes. they'll pick up the remainder of what they need just from the arbitrage owners.
FWIW, if you strictly read Novo's release they are only receiving $8.48/share. Some argue what Novo really meant is they were booking DKR $1.1B net proceeds. That's not what the release says, though. http://ow.ly/2Bf4L
BMY formally discontinued Interferon Lambda, according to @JMPawlotsky. This is worth noting only because of the debate on this board a couple of years ago with respect to the medical and commercial value of this program and whether BMY “stole” ZymoGenetics (#msg-54152162).