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 (4S,20S)-22-hydroxy-20-(4-methoxyphenyl)-4-methyl-3,17-dioxatricyclo[12.8.0.016,21]docosa-1(22),12,14,16(21)-tetraene-2,8,18-trione .
user
C28H30O7
assistant