title: Ethyl 2-(3,4-dimethyl-5,5-dioxo-1H,4H-benzo[e]pyrazolo-[4,3-c][1,2]thia-zin-1-yl)acetate.
abstract: In the title mol-ecule, C(15)H(17)N(3)O(4)S, the heterocyclic thia-zine ring adopts a twist-boat conformation, which differs from that in related compounds, with adjacent S and C atoms displaced by 0.981 (4) and 0.413 (5) Å, respectively, on the same side of the mean plane formed by the remaining ring atoms. The mean plane of the benzene ring makes a dihedral angle of 23.43 (14)° with the mean plane of the pyrazole ring. In the crystal, mol-ecules are connected by weak C-H⋯O hydrogen bonds to form a three-dimensional network. The H atoms of the methyl group attached to the pyrazole ring were refined over six sites with equal occupancies.
authors.affiliation: Institute of Chemistry, University of the Punjab, Lahore 54590,  Pakistan.
authors.forename: Sana
authors.initials: S
authors.lastname: Aslam
authors.forename: Hamid Latif
authors.initials: HL
authors.lastname: Siddiqui
authors.forename: Matloob
authors.initials: M
authors.lastname: Ahmad
authors.forename: Muhammad
authors.initials: M
authors.lastname: Zia-Ur-Rehman
authors.forename: Masood
authors.initials: M
authors.lastname: Parvez