You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(15Z,18Z,21Z,24Z,27Z)-N-[(E)-1-[5-[3,4-dihydroxy-6-(hydroxymethyl)-5-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3-hydroxytricos-4-en-2-yl]triaconta-15,18,21,24,27-pentaenamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C71H125NO18
assistant