You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (4aR,7S,7aR)-4-(5-fluoropyrimidin-2-yl)-7-(imidazol-1-ylmethyl)-3,4a,5,6,7,7a-hexahydro-2H-cyclopenta[b][1,4]oxazine by IUPAC nomenclature, provide its molecular formula.
user
C15H18FN5O
assistant