You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named (5-chloro-8-methyl-1-propyl-4,9-dihydro-3H-pyrano[3,4-b]indol-1-yl) acetate is given. What is its corresponding molecular formula?
user
C17H20ClNO3
assistant