You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4aS,7S,7aR)-4-[(4-methyl-1,3-thiazol-5-yl)methyl]-7-(pyridin-3-ylmethoxy)-3,4a,5,6,7,7a-hexahydro-2H-cyclopenta[b][1,4]oxazine is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H23N3O2S
assistant