You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl 4-[2-(5-hydroxy-6-methoxycarbonyl-4-oxopyran-2-yl)ethyl]-2,2-dimethyl-1,3-oxazolidine-3-carboxylate;tert-butyl 4-[(E)-2-(6-methoxycarbonyl-4-oxo-5-phenylmethoxypyran-2-yl)ethenyl]-2,2-dimethyl-1,3-oxazolidine-3-carboxylate;oxolane is the IUPAC name of a molecule. Please give its molecular formula.
user
C49H66N2O17
assistant