You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-N-[(6-chloro-3,4-dihydro-2H-1,5-benzodioxepin-8-yl)methyl]-3-(2,3-dihydro-1H-indol-7-ylmethylamino)-2-methyl-N-(2-methylpropyl)propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H36ClN3O3
assistant