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 methyl 3-[[5-[(1S)-1-amino-2-phenylethyl]-4-benzyl-1,2,4-triazol-3-yl]sulfanyl]propanoate ?
user
C21H24N4O2S
assistant