ASTX's pipeline identifies the BACE inhibitor partnered with AZN as AZD3293 (astx.com/pipeline/products/preclinical#azdxxxx ) and it appears to be pre-clinical. Was AZD3839 shelved, re-named, or what?
Did some Googling and found my answer in an Edison Investment Research report dated 7/26/12. After Phase 1 studies, AZD3839 was dropped in favor of AZD3293, which is now in pre-clinical studies.