Cefdinir USP RC A 

Chemical Name: Cefdinir Open-Ring Lactone ;  2-[(Z)-2-(2-Aminothiazol-4-yl)-2-(hydroxyimino)acetamido]-2-[(2RS,5RS)-5-methyl-7-oxo-2,4,5,7-tetrahydro-1H-furo[3,4-d][1,3]thiazin-2-yl]acetic acid sodium salt ;

Smile: O=C([O-])C(NC(/C(C1=CSC(N)=N1)=N\O)=O)C2SCC3=C(C(OC3C)=O)N2.[Na+]