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In the title mol­ecule, C12H13NO5S, the benzisothia­zole ring system is essentially planar (r.m.s. deviation = 0.0169 Å) as is the –C—C(=O)—O—C– sequence of atoms in the vicinity of the acetate group (r.m.s. deviation = 0.0044 Å). The mean plane of these atoms forms a dihedral angle of 88.41 (7)° with the benzisothia­zole ring system. In the crystal, weak C—H...O hydrogen bonds involving methyl­ene and methyne H atoms form R43(20) graph-set motifs.

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The title compound, C9H12N2O2, is approximately planar (r.m.s. deviation = 0.13 Å for all non-H atoms). The carbonyl O atom is involved as acceptor in three different hydrogen-bond inter­actions. One N—H...O and the C—H...O(carbonyl) contact together with a weak C—H...O(eth­oxy) interaction link the mol­ecules into sheets parallel to (102). These are further linked into a three-dimensional network via the remaining C—H...O(carbon­yl) hydrogen bond and a C(methyl­ene)—H...π inter­action
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