Isoprop-yl (3,4-dimethyl-5,5-dioxo-4H-pyrazolo-[4,3-c][1,2]benzothia-zin-2-yl)acetate.

In the title mol-ecule, C(16)H(19)N(3)O(4)S, the heterocyclic thia-zine ring adopts a half-chair conformation, with the S and N atoms displaced by 0.547 (2) and -0.254 (3) Å, respectively, from the plane formed by the remaining atoms. In the crystal, weak C-H⋯N and C-H⋯O hydrogen bonds link the mol-ecules.