You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule methyl (3S)-3-[3-(diaminomethylideneamino)propylamino]-3-[4-(6-methyl-2-oxo-7H-pyrrolo[2,3-d]pyrimidin-3-yl)phenyl]propanoate into molecular formula.
user
C21H27N7O3
assistant