You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(18Z,21Z,24Z,27Z,30Z,33Z)-N-[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-hydroxyheptadecan-2-yl]hexatriaconta-18,21,24,27,30,33-hexaenamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C71H125NO18
assistant