You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(1,2,3,3a,4,5,6,6a-octahydrocyclopenta[c]pyrrol-3-ylmethyl)-N-(2-methylpropyl)cyclopropanamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H28N2
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