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 (6S,7R)-3-(acetyloxymethyl)-8-oxo-7-[[2-phenyl-2-[(5-thiophen-2-yl-1,2-oxazole-3-carbonyl)amino]acetyl]amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid .
user
C26H22N4O8S2
assistant