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 methyl (1S,4R,6S,7Z,14R,18R)-18-hydroxy-14-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]-2,15-dioxo-16-azatricyclo[14.3.0.04,6]nonadec-7-ene-4-carboxylate .
user
C26H39NO7
assistant