You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[[4-ethyl-6-[(3S)-3-methyl-3,4-dihydro-1H-isoquinolin-2-yl]pyrimidin-2-yl]amino]propan-1-ol is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H26N4O
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