You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
sodium;(1R,2R,7R,12R,13R)-12-[[(2Z)-2-(2-amino-1,3-thiazol-4-yl)-2-methoxyiminoacetyl]amino]-11-oxo-3-oxa-14-thia-10-azatetracyclo[6.6.0.02,7.010,13]tetradec-8-ene-9-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H18N5NaO6S2
assistant