You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(6S,9S)-9-(1,3-benzodioxol-5-yl)-6-pyridin-3-yl-5,6,8,9,10,11-hexahydrobenzo[b][1,4]benzodiazepin-7-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H21N3O3
assistant