You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[(1S,2R,3S,4R)-4-[6-[2,2-bis(4-hydroxyphenyl)ethylamino]-2-chloropurin-9-yl]-2,3-dihydroxycyclopentyl]propanamide by IUPAC nomenclature, provide its molecular formula.
user
C27H29ClN6O5
assistant