I mailed them a couple months ago about this and this was their reply:
Hello,
Thank you for contacting us about the ANAVEX 2-73, catalog # 5058. This product has been discontinued due to low sales and we no longer have a license to sell this product. We do not have any recommended alternative products. I am sorry for the inconvenience. Please let me know if there is anything else I can help you with. Have a great evening.
Kind regards,
Mitch Brabec
Technical Service Care Associate I
R&D Systems, a Bio-Techne brand
Learn more: www.bio-techne.com