2-[(3-ethyl-5-methoxy-3H-benzothiazol-2-ylidene)methyl]-1-(3-sulphonatopropyl)naphtho[1,2-d]thiazolium

2-[[3-Ethyl-5-methoxybenzothiazol-2(3H)-ylidene]methyl]-1-(3-sulfonatopropyl)naphtho[1,2-d]thiazol-1-ium