You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-cyclooctyl-11-methyl-10-oxa-3,6,8-triazatricyclo[7.3.0.02,6]dodeca-1(9),2,7,11-tetraene-12-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H24N4O2
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