You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name (2S)-2-[(3-cyanopyrazin-2-yl)amino]-4-[2-(3,5-dimethylpyrazol-1-yl)ethyl-[4-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)butyl]amino]butanoic acid ?
user
C28H37N9O2
assistant