You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(1E,4Z,7Z)-6-(1-fluoroethyl)cycloocta-1,4,7-trien-1-yl]-5-(2-nitrosoethyl)-4H-imidazole is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H18FN3O
assistant