You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [(7S,9E,11S,12R,13S,14R,15R,16R,17S,18S,19E,21Z)-2,15,17,27,29-pentahydroxy-11-methoxy-3,7,12,14,16,18,22-heptamethyl-6,23-dioxo-26-(thiophen-2-ylmethylideneamino)-8,30-dioxa-24-azatetracyclo[23.3.1.14,7.05,28]triaconta-1(28),2,4,9,19,21,25(29),26-octaen-13-yl] acetate by IUPAC nomenclature, provide its molecular formula.
user
C42H50N2O12S
assistant