You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-(3-chloro-4-hydroxyanilino)-7-[2-[(1S,5R)-3-methyl-3-azabicyclo[3.1.0]hexan-6-yl]ethynyl]quinazolin-6-yl]but-3-en-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H23ClN4O2
assistant