You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(4S)-4-(3-fluoropyridin-2-yl)oxy-1,3,4,5-tetrahydropyrrolo[1,2-a][1,4]diazepin-2-yl]-(2-methyl-1,3-thiazol-4-yl)methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H17FN4O2S
assistant