You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-methyl-1-[(1R,2S)-2-phenylcyclopropyl]sulfonyl-2,3-dihydropyrido[2,3-b]pyrazine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H19N3O2S
assistant