You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(2R,4S,5R)-3-chloro-3-(2-chloroethynyl)-4-hydroxy-5-[(1S)-1-hydroxyethyl]oxolan-2-yl]-6-methylpyrimidine-2,4-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H14Cl2N2O5
assistant