2-(3-Hydroxypropyl)-3-methyl-6,8-dihydroimidazo[4',5':5,6]benzo[1,2-b][1,4]thiazin-7(3H)-one is an intermediate in synthesizing 4-(6-(2-Chloroethyl)-3-methyl-3,6,7,8-tetrahydroimidazo[4',5':5,6]benzo[1,2-b][1,4]thiazin-2-yl)butanoic Acid (C367195), a degradation production of Bendamustine (B132500), which is used as an anticancer drug.