You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule N-[(2S,3S,6R)-2-(hydroxymethyl)-6-[2-[(3-methoxyphenyl)methylamino]-2-oxoethyl]oxan-3-yl]cyclobutanecarboxamide .
user
C21H30N2O5
assistant