Nitrobanzamide useful as antiarrythmic agent

Hydrated N-[3-[[2-(3,4-dimethoxyphenyl)ethyl]amino]propyl]-4-nitro benzamide hydrochloride characterised in that it: (i) comprises water in the range of from 1.7 to 2.4 molar equivalents; and/or (ii) has a melting point above 145 DEG C and/or, (iii) provides an infra red spectrum containing peaks at 3510, 3342, 3076, 1665, 1598, 1343, 1330, 1216 and 801 cm<-1>; and/or (iv) provides a solid state nuclear magnetic resonance spectrum containing chemical shifts substantially as represented in Table I; and/or (v) provides an X-ray powder refraction (XRPD) pattern substantially as represented in Table II; a process for preparing such a compound, a pharmaceutical composition comprising such a compound and the use of such a compound in medicine.