You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-hydroxy-N-[3-hydroxy-1-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyhexadeca-4,8-dien-2-yl]octadec-3-enamide .
user
C40H73NO9
assistant