You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (21Z,24Z,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-hydroxynonadecan-2-yl]dotetraconta-21,24,27,30,33,36,39-heptaenamide .
user
C73H129NO13
assistant