The starting material is a 1,4-benzothiazine, which is a six-membered ring containing a sulfur atom in the 1-position and a nitrogen atom in the 4-position.
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2H-1,4-Benzothiazin-3(4H)-one, 2-[(acetyloxy)phenylmethyl]-2-hydroxy-4-methyl-
Benzenethiol, 2-amino-4,5-dimethyl-
2H-1,4-Benzothiazine-2-carboxamide, 3,4-dihydro-N-(4-methoxyphenyl)-4-methyl-3-oxo-
