You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-[2-(5-chloro-[1,2,4]triazolo[4,3-a]pyridin-3-yl)ethynyl]-4-hydroxyphenyl]-4-[(4-methylpiperazin-1-yl)methyl]-3-(trihydroxymethyl)benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H27ClN6O5
assistant