You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4-[2-[(4-amino-2-oxo-1H-quinazolin-5-yl)oxy]ethyl]piperidine-1-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C16H20N4O4
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