You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 3-O-(cyclopropylmethyl) 1-O-propyl 4-[4-(oxiran-2-yl)butanoyl]cyclohexane-1,3-dicarboxylate into molecular formula.
user
C21H32O6
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