You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4-[2-[5-(3-chloro-4-propan-2-yloxyphenyl)-1,3,4-thiadiazol-2-yl]-6,7-dihydro-4H-pyrazolo[4,3-c]pyridin-5-yl]butanoic acid by IUPAC nomenclature, provide its molecular formula.
user
C21H24ClN5O3S
assistant