You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1,3-dimethyl-5-(3-methyl-3,4,6,7,8,8a-hexahydro-1H-pyrrolo[1,2-a]pyrazin-2-yl)pyrazol-4-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H23N5
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