3-ethyl-2-[[3-[3-[3-[(3-ethyl-3H-benzothiazol-2-ylidene)methyl]-5,5-dimethylcyclohex-2-en-1-ylidene]prop-1-enyl]-5,5-dimethylcyclohex-2-en-1-ylidene]methyl]benzothiazolium perchlorate