You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[5-[(E)-2-(2-iminopyrazin-1-yl)ethenyl]cyclohepta-1,4,6-trien-1-yl]oxy-1-morpholin-4-ylethanone by IUPAC nomenclature, provide its molecular formula.
user
C19H22N4O3
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