A salt of (E)-N-(2-amino-phenyl)-3-{1-[4-(1-methyl-1H-pyrazol-4-yl)-benzenesulfonyl]-1H-pyrrol-3-yl}-acrylamide selected from the group consisting of the hydrobromide, methansulfonate, hemi ethane-1,2-disulfonate, benzenesulfonate, toluenesulfonate and 2-naphthalenesulfonate.