Disclosed are an alpha 7 nAChR receptor modulator compound 4 (5 (4 chlorophenyl) 2 (2 cyclopropylacetyl) 1 4 dimethyl lH pyrrol 3 yljbenzenesulfonamide its tautomeric form its pharmaceutically acceptable salts pharmaceutical compositions comprising the compound or a salt thereof and a method of treating various diseases disorders or conditions for example Alzheimer s disease mild cognitive impairment senile dementia vascular dementia dementia of Parkinson s disease and attention deficit disorder.