You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [(3E)-1-amino-4-[[(2S,3R,4R,5R)-3-[2-(difluoromethoxy)-3,4-difluorophenyl]-4,5-dimethyl-5-(trifluoromethyl)oxolane-2-carbonyl]amino]-1-oxohexa-3,5-dien-2-ylidene]nickel .
user
C21H19F7N2NiO4
assistant