Benzothiazolium, 3-ethyl-2-[[3-[3-[3-[(3-ethyl-5,6-dimethoxy-2(3H)-benzothiazolylidene)methyl]-5,5-dimethyl-2-cyclohexen-1-ylidene]-1-propenyl]-5,5-dimethyl-2-cyclohexen-1-ylidene]methyl]-5,6-dimethoxy-, perchlorate