You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aR,6aR)-4-(2-hydroxyethyl)-1-(thiophen-3-ylmethyl)-3,3a,6,6a-tetrahydro-2H-pyrrolo[3,2-b]pyrrol-5-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C13H18N2O2S
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