in order to find explicitly the influence of the conformation of this side chain in the enzymatic mechanism , we have analyzed by experimental and theoretical methods ( x-ray diffraction , nmr , ir , pcilo ) the molecular structure of six resistant penicillins and derivatives : oxacillin , cloxacillin , dicloxacillin , flucloxacillin , methicillin , nafcillin , cloxacillin sulfoxide , and oxacillinpenicilloic acid .
C0030842
penicillins
C0025643
methicillin