Gladpick: You are right. I am not a patent lawyer. However I do know that in the past enantiomers of certain drugs had been patented as a new chemical entity. If you do not know what I am talking about, then you know less than I do. The question remains whether the deuterated Ivacafor be considered a new chemical entity.
Does the patent for Ivacafter protect against someone using deuterated Ivacafor? If not I believe that Concert could develop and sell deuterated Ivacaftor without any agreement or assistance from Vrtx.