Actelion has signed an agreement with GSK valued at as much as $3.3 billion to jointly develop and market Actelion’s experimental sleeping pill candidate, almorexant. Actelion will receive an upfront payment of $148 million and $409 million upon registration of the drug. Actelion is also eligible to receive as much as $2.7 billion in success-based milestones, as well as royalties. Under the agreement, GSK will receive exclusive worldwide rights, excluding Japan, to co-develop and co-commer...