(2S,3S)-2-(4-Methoxyphenyl)-5-(2-(methylamino)ethyl)-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]thiazepin-3-yl acetate hydrochloride (Diltiazem Impurity)

(2S,3S)-2-(4-Methoxyphenyl)-5-(2-(methylamino)ethyl)-4-oxo-2,3,4,5-tetrahydrobenzo[b][1,4]thiazepin-3-yl acetate hydrochloride (Diltiazem Impurity)