You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N'-[9-[(1S,3R,4S)-7-[[di(propan-2-yl)amino]-(2-isocyanoethoxy)phosphanyl]oxy-1-(morpholin-4-ylmethyl)-2,5-dioxabicyclo[2.2.1]heptan-3-yl]purin-6-yl]-N,N-dimethylmethanimidamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H42N9O5P
assistant