Evercore ISI analyst Umer Raffat said the readout of the Phase 2b trial of colonic-release Linzess, which is due before year end according to Ironwood (IRWD), is a "wayyy under the radar" potential catalyst for Allergan (AGN), which he notes is partnered on the drug. Expectations are "basically" for the trial to fail completely, but if formulation 1 of colonic release delivers Linzess-like efficacy or has better pain relief than Linzess, it would extend the tail or possibly grow the franchise, he said. In a "blue sky scenario," formulation 2 of colonic release would show good abdominal pain relief, which would open up several new indications for the drug, added Raffat, who has a Buy rating and $296 price target on Allergan shares.