You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (6S,7R)-3-(acetyloxymethyl)-7-[[2-(2-amino-1,3-thiazol-4-yl)-2-prop-2-enoxyiminoacetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C18H19N5O7S2
assistant