You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(27Z,30Z,33Z,36Z,39Z)-N-[1-[3,4-dihydroxy-6-(hydroxymethyl)-5-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-3-hydroxyheptadecan-2-yl]dotetraconta-27,30,33,36,39-pentaenamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C71H129NO13
assistant