You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R,3R,4R,5R)-3-[bis(2-cyanoethoxy)phosphoryloxy]-4-[tert-butyl(dimethyl)silyl]oxy-5-(5-ethynyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methyl bis(2-cyanoethyl) phosphate is the IUPAC name of a molecule. Please give its molecular formula.
user
C29H40N6O12P2Si
assistant