You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[3a-(hydroxymethyl)-1,2,3,4,6,6a-hexahydropyrrolo[3,4-c]pyrrol-5-yl]-7-methylquinolin-3-yl]methanol;dihydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H25Cl2N3O2
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