. "(6S,7R)-4-(carbamoyloxymethyl)-7-methoxy-8-oxo-7-(2-(thiophen-2-yl)acetamido)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid" . "cefoxitin" . . . . . . . . . . . . . . . . . .