1-(2-Hydroxyethyl)-3-phenyl-2-thioxo-5-[2-[3-[3-(sodiosulfooxy)propyl]benzoxazol-2(3H)-ylidene]ethylidene]imidazolidin-4-one

1-(2-hydroxyethyl)-3-phenyl-2-thioxo-5-[[3-[3-(sulphooxy)propyl]-3H-benzoxazol-2-ylidene]ethylidene]imidazolidin-4-one, monosodium salt