Abstract
The crystal structure of sodium (5R,6S)-6-[(R)-1-hydroxyethyl]-7-oxo-3-[(R)-2-tetrahydrofuryl]-4-thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate 2.5-hydrate, Na + .C 12 H 14 NO 5 S - .5/2H 2 O, a member of a new class of β-lactam antibiotics, has been determined by X-ray diffraction. The C(3)-S(1) bond (bridgehead C atom) is longer than the C(2)-S(1) bond, although the latter is usually longer in penicillins and cephalosporins. The crystal packing shows a three-layer sheet in which two layers of the molecules are held together by Na + ions and by water molecules through a network of hydrogen bonds
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