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 [(2S)-1-(2,3-dihydroindol-1-yl)-1-oxopropan-2-yl]-methyl-[2-(4-methylanilino)-2-oxoethyl]azanium ?
user
C21H26N3O2+
assistant