A couple of years ago an economic think tank (I forget the name) that concerns itself with such things estimated that a listed company in possession of an efficacious AD drug that was allowed to file an NDA was worth an additional $20B in market cap, and that an FDA approval was worth an additional $42B in market cap.
Times have changed in the biotech sector, and even then an approval for Anavex, which will need a large partner, may have resulted in half those amounts. There was no mention of the EU market which, for all I know, may have been included in those numbers. And I guess we should apply a "Who is Anavex discount?" as well.
Nonetheless, even with all those caveats, by 2025 an Anavex buyout, if blarcamesine will have been approved for sale in the US and the EU for Alzheimer's Disease, should be priced at multiples of $14B. (Remember, in a buyout you don't apply a partnership discount.)