Piperidinium,1-[[4-[[[[[3-[3,3-dibutyl-7-(dimethylamino)-2,3,4,5-tetrahydro-1,1-dioxido-1,4-benzothiazepin-5-yl]phenyl]amino]thioxomethyl]amino]methyl]phenyl]methyl]-1-(2-propenyl)-, bromide