2-3-[(2,3-dimethylphenyl)-methylamino]-6-[(2-ethylphenyl)-methylamino]-xanthylium-9-yl-benzenesulfonate (7-20 %);
2-3-[(2,3-diméthylphényl)-méthylamino]-6-[(2-éthylphényl)-méthylamino]-xanthylium-9-yl-benzènesulfonate (7-20 %);