You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 1-[10-[(3-ethynylphenyl)methylamino]-2,3-dihydropyrimido[4,5-h][1,4]benzoxazin-4-yl]prop-2-en-1-one ?
user
C22H18N4O2
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