You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(4R)-4-hydroxyoxolan-3-yl]-7-(methylamino)-5-[[6-[(3R)-oxan-3-yl]pyridin-2-yl]amino]pyrazolo[1,5-a]pyrimidine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H27N7O4
assistant