You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named N-[(7R)-1,2,3-trimethoxy-9-oxo-10-(pyridin-2-ylmethylamino)-6,7-dihydro-5H-benzo[a]heptalen-7-yl]acetamide is given. What is its corresponding molecular formula?
user
C27H29N3O5
assistant