You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [2-[[(2R,3S,4R,5R)-5-[[2-chloro-6-(cyclopentylamino)-5-methylpyrimidin-4-yl]-(methylideneamino)amino]-3,4-dihydroxyoxolan-2-yl]methoxy]-1-hydroxy-3-(2H-tetrazol-5-ylmethoxy)propan-2-yl]phosphonic acid .
user
C21H33ClN9O9P
assistant