You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methane;1-methyl-3-propan-2-ylpiperidine;1-methyl-4-propan-2-ylpiperidine;propan-2-ylcyclohexane is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H60N2
assistant