You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-(cyclopropylmethyl)-1,3-dimethyl-8-(2-oxo-2-pyrrolidin-1-ylethyl)sulfanyl-6-sulfanylidenepurin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H23N5O2S2
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