You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2S,4S,7R,8S,9S,13R,18R,19S)-19-hydroxy-2,9,13,17,17-pentamethyl-7-(4-methylpent-3-enyl)-5-oxapentacyclo[10.8.0.02,9.04,8.013,18]icos-1(20)-ene-6,16-dione into molecular formula.
user
C30H44O4
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