You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,2S,3R,5R)-3-[[2-amino-6-chloro-5-(2-pyridin-4-ylethenyl)pyrimidin-4-yl]amino]-5-(hydroxymethyl)cyclopentane-1,2-diol is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H20ClN5O3
assistant