Methyl 2-(2-amino-1,3-thia­zol-4-yl)-2-[(Z)-methoxy­carbonyl­methoxy­imino]ethano­ate

In the mol­ecule of the title compound, C9H11N3O5S, the thia­zole ring is oriented at dihedral angles of 87.33 (3) and 87.18 (3)° with respect to the planar (r.m.s. deviations 0.0136 and 0.0139 Å) methyl ester groups. The dihedral angle between the methyl ester groups is 44.20 (3)°. In the crystal structure, inter­molecular N—H⋯N, N—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules along the a axis, through R 2 2(8) and R 2 2(22) ring motifs, forming infinite two-dimensional polymeric sheets. π–π Contacts between the thia­zole rings [centroid–centroid distance = 3.536 (2) Å] may further stabilize the structure

(2Z)-Methyl 2-(2-amino-1,3-thia­zol-4-yl)-2-(methoxy­imino)ethano­ate

In the title compound, C7H9N3O3S, the planes of the 2-amino-1,3-thia­zol-4-yl and the methyl ester groups are oriented at a dihedral angle of 67.06 (7)°. In the crystal, inversion dimers linked by pairs of N—H⋯N hydrogen bonds occur, forming R 2 2(8) ring motifs. The dimers are inter­linked by N—H⋯O hydrogen bonds, resulting in sheets propagating in the ac plane

Machinist

232 p.; 24 cm

7-Benzenesulfonamido-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]octa-2-ene-2-carboxylic acid monohydrate

In the title compound, C(14)H(14)N(2)O(5)S(2)center dot H(2)O, the six-membered ring fused to the beta-lactam unit has a twisted conformation. Weak intramolecular N-H center dot center dot center dot S and C-H center dot center dot center dot O interactions occur. Intermolecular C-H center dot center dot center dot S, N-H center dot center dot center dot O, C-H center dot center dot center dot O and O-H center dot center dot center dot O hydrogen-bonding interactions stabilize the crystal structure, forming a three-dimensional network. Weak C-H center dot center dot center dot pi interactions are also present