You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(7R,8R)-7-azido-2,6-dimethyl-8-phenylmethoxy-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H21N3O4
assistant