You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule (3R,6S,9S,16R,19S)-9-[[(2S)-2-acetamidohexanoyl]amino]-N-[(2S)-1-amino-3-(1H-indol-3-yl)-1-oxopropan-2-yl]-3-benzyl-6,19-bis[3-(diaminomethylideneamino)propyl]-2,5,8,12,18-pentaoxo-1,4,7,13-tetrazacyclononadecane-16-carboxamide ?
user
C50H73N15O9
assistant