You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[[2-(3,4-dihydro-1H-isoquinolin-2-yl)-2-methylpropyl]carbamoyl]cyclopropane-1-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H24N2O3
assistant