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 identified by (4S,6R,7R)-10-fluorospiro[2,12,17,21,22,25-hexazahexacyclo[17.5.2.02,7.04,6.08,13.022,26]hexacosa-1(25),8(13),9,11,19(26),20,23-heptaene-16,1'-cyclopropane]-18-one ?
user
C22H21FN6O
assistant