You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-[3-[4-[(7S)-4-amino-7-methyl-5-oxo-7,8-dihydropyrimido[5,4-f][1,4]oxazepin-6-yl]phenyl]spiro[5.5]undecan-9-yl]acetic acid into molecular formula.
user
C27H34N4O4
assistant