True that there have not been MS trials of 2-73. If fact 2-73 has not been approved for anything as of now. That is not to suggest that 2-73 won't ever be approved for an indication. Once it is approved for one indication that opens the door for additional trials for other indications.
Missling is building a moat around 2-73 so that if it does turn out to be a "wide spectrum" CNS drug Anavex will have strong protections to move forward.