You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5-[ethylamino(2-methylpropoxy)phosphoryl]oxypyridine-2-carbonitrile;5-hydroxypyridine-2-carbonitrile by IUPAC nomenclature, provide its molecular formula.
user
C18H22N5O4P
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