You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
12-oxo-11-pentyl-7-thia-9,11-diazatricyclo[6.4.0.02,6]dodeca-1(8),2(6),9-triene-3-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H18N2O3S
assistant