You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(9Z,19Z,21Z)-2,15,17,27,29-pentahydroxy-26-[(Z)-(2-hydroxyethylhydrazinylidene)methyl]-11-methoxy-3,7,12,14,16,18,22-heptamethyl-6,23-dioxo-8,30-dioxa-24-azatetracyclo[23.3.1.14,7.05,28]triaconta-1(29),2,4,9,19,21,25,27-octaen-13-yl] acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C40H53N3O13
assistant