You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-(3,4,4a,5,6,7,8,8a-octahydro-1H-isoquinolin-2-ylmethyl)-2-methyl-N-propylpentan-1-amine into its molecular formula.
user
C19H38N2
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