You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (4S)-3,4-dihydroxy-4-[(1S)-1-hydroxy-4-methylpent-3-enyl]-5-(3-methylbut-2-enyl)-2-(2-methylpropanoyl)cyclopent-2-en-1-one by IUPAC nomenclature, provide its molecular formula.
user
C20H30O5
assistant