You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-[[6-amino-2-[[2-[(2-amino-3-methylpentanoyl)amino]-5-(diaminomethylideneamino)pentanoyl]amino]hexanoyl]amino]-3-sulfanylpropanoic acid into molecular formula.
user
C21H42N8O5S
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