You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [7-[[(2E)-2-[2-[(2-chloroacetyl)amino]-1,3-thiazol-4-yl]-2-methoxyiminoacetyl]amino]-2-methyl-5,8-dioxo-5lambda4-thia-1-azabicyclo[4.2.0]octan-3-yl]methyl acetate .
user
C18H22ClN5O7S2
assistant