108772-83-4 2,2'-(2,5-Thiophenediylbis(4,2-pyrimidinediylthio))bis(N,N-dimethylethanamine) dihydrobromide Ethanamine, 2,2'-(2,5-thiophenediylbis(4,2-pyrimidinediylthio))bis(N,N-dimethyl-, dihydrobromide