You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(18E)-17-ethyl-1,14-dihydroxy-12-[1-[4-[1-(3-hydroxypropyl)indol-5-yl]oxy-3-methoxycyclohexyl]prop-1-en-2-yl]-23,25-dimethoxy-13,19,21,27-tetramethyl-11,28-dioxa-4-azatricyclo[22.3.1.04,9]octacos-18-ene-2,3,10,16-tetrone is the IUPAC name of a molecule. Please give its molecular formula.
user
C54H80N2O13
assistant