You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(6E)-5-imino-2-[(1S)-1-phenylpropyl]-6-[(1-phenylpyrrol-2-yl)methylidene]-[1,3,4]thiadiazolo[3,2-a]pyrimidin-7-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H21N5OS
assistant