You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-[[2-(1,2,3,5,6,7-hexahydro-s-indacen-4-yl)hydrazinyl]-hydroxyamino]butyl]formamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H26N4O2
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