You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S)-7-chloro-1-(4-ethoxy-3-methoxyphenyl)-2-(5-methyl-1,3,4-thiadiazol-2-yl)-1H-chromeno[2,3-c]pyrrole-3,9-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H18ClN3O5S
assistant