You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-tert-butyl-N-ethyl-1,2,3,4,4a,5,6,7,8,8a-decahydroisoquinoline-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H30N2O
assistant