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 (2S)-2-[(2R,5R,6S)-3-acetamido-2-[(1R,3R)-3-ethyl-5-[4-(3-sulfopentanoylamino)butanoyl]-2-[(2S,4S,5S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxycyclohexyl]oxy-5-hydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-3-cyclohexylpropanoic acid ?
user
C40H68N2O18S
assistant