You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule [amino-[[(1R,4S)-4-(6-aminopurin-9-yl)cyclopent-2-en-1-yl]methoxy]phosphoryl] (2S)-2-(N-methoxyanilino)propanoate ?
user
C21H26N7O5P
assistant