You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(3R,4S)-3-hydroxy-4-[2-(4-methoxyphenyl)ethylamino]-2,2-dimethyl-7-nitro-3,4-dihydrochromen-6-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H27N3O6
assistant