You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-amino-4-[[6-amino-1-[[1-[[1-carboxy-2-(1H-imidazol-5-yl)ethyl]amino]-1-oxopropan-2-yl]amino]-1-oxohexan-2-yl]amino]-4-oxobutanoic acid by IUPAC nomenclature, provide its molecular formula.
user
C19H31N7O7
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