You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-amino-6-chloro-5-[(3S)-4-[1-[(4-chlorophenyl)methyl]piperidin-4-yl]-3-ethylpiperazin-1-yl]-N-[(3-oxo-1,2-oxazol-5-yl)methyl]pyrazine-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H34Cl2N8O3
assistant