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 (3R,6S,9S,17S,20S)-9-[[(2S)-2-acetamidohexanoyl]amino]-6-(1H-imidazol-5-ylmethyl)-20-(1H-indol-3-ylmethyl)-3-(naphthalen-2-ylmethyl)-2,5,8,11,19,22-hexaoxo-1,4,7,12,18,21-hexazabicyclo[21.2.2]heptacosane-17-carboxamide ?
user
C54H68N12O9
assistant