You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (2S)-2-amino-N-[6-(4-fluorophenyl)-5-methyl-7-pyridin-4-ylpyrrolo[2,3-b]pyrazin-3-yl]-3-methylsulfanylbutanamide .
user
C23H23FN6OS
assistant