You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1R,9S,12S,13S,14R,16S,17R,21S,23S,24R,25S,27R)-12-[(E)-1-[(1R,3R,4R)-4-[tert-butyl(dimethyl)silyl]oxy-3-methoxycyclohexyl]prop-1-en-2-yl]-17-ethyl-1,14,18-trihydroxy-23,25-dimethoxy-13,19,21,27-tetramethyl-11,28,29-trioxa-4-azatetracyclo[22.3.1.116,19.04,9]nonacosane-2,3,10-trione by IUPAC nomenclature, provide its molecular formula.
user
C49H85NO13Si
assistant