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 benzyl 2-[3-chloro-2-methyl-6-oxo-5-[[(3S)-4-(2,2,2-trifluoroacetyl)morpholin-3-yl]methylamino]pyrazin-1-yl]acetate ?
user
C21H22ClF3N4O5
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