You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1S,5S,6R,7R)-6-[4-(5-acetyl-4-methyl-1,3-thiazol-2-yl)piperidine-1-carbonyl]-3-ethyl-10-oxa-3-azatricyclo[5.2.1.01,5]dec-8-en-4-one by IUPAC nomenclature, provide its molecular formula.
user
C22H27N3O4S
assistant