Single-Crystal X-ray and Solid-State NMR Characterisation of AND-1184 and Its Hydrochloride Form

In this study, we report on a structural investigation of AND-1184, with the chemical name N-[3-[4-(6-fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]propyl]-3-methylbenzenesulfonamide (MBS), and its hydrochloride form (MBS(HCl)); AND-1184 is a potential API for the treatment of dementia. The single-crystal X-ray investigation of both forms results in monoclinic crystal systems with P2(1)/c and C2/c symmetry for MBS and MBS(HCl), respectively. This solid-state NMR study, combined with quantum-chemical calculations, allowed us to assign all (13)C and most (1)H signals. The MBS structure was defined as a completely rigid system without significant dynamic behaviours, whereas MBS(HCl) exhibited limited dynamic motion of the aromatic part of the molecule.