You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name (2R,4aR,6S,7R,8R,8aS)-6-ethoxy-7-nitro-2-phenyl-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxin-8-ol ?
user
C15H19NO7
assistant