You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-[2-(1-adamantylsulfanyl)acetyl]-2-amino-3,5,6,8-tetrahydropyrido[3,4-d]pyrimidin-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H26N4O2S
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