You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[1-[4-(6-chloro-2-phenylpyrido[2,3-b]pyrazin-3-yl)-3-propylphenyl]cyclobutyl]carbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H33ClN4O2
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