Cefmatilen (INN, codenamed S-1090) is an orally-active cephalosporin antibiotic. It was developed in Japan and first described in 1992.
{{Drugbox | verifiedrevid = 443726531 | IUPAC_name = (6R,7R)-7-{[(2Z)-2-(2-amino-1,3-thiazol-4-yl)- 2-(hydroxyimino)acetyl]amino}-8-oxo-3-{[(1H-1,2,3- triazol-4-ylsulfanyl)methyl]sulfanyl}-5-thia-1- azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid | image = Cefmatilen.svg | image_class = skin-invert-image | width = 280
| tradename = | pregnancy_AU = | pregnancy_US = | pregnancy_category = | legal_AU = | legal_CA = | legal_UK = | legal_US = | legal_status = | routes_of_administration = Oral
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