You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule methyl 4-[[2-(3,4-difluorophenyl)-11-oxopyrido[2,1-b]quinazoline-6-carbonyl]amino]cyclohexane-1-carboxylate ?
user
C27H23F2N3O4
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