You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(15Z,18Z)-2-hydroxy-N-[(4E,8E)-3-hydroxy-1-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoctadeca-4,8-dien-2-yl]triaconta-15,18-dienamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C54H99NO9
assistant