You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl (2S)-2-[(4-cyano-1-morpholin-4-yl-5,6,7,8-tetrahydroisoquinolin-3-yl)sulfanyl]propanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H25N3O3S
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