You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(17-oxatetracyclo[8.4.3.01,10.02,7]heptadeca-2,4,6-trien-16-ylidene)sulfamoyl chloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H18ClNO3S
assistant