You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (2R,4aR,6aS,6aS,6bR,14aS,14bS)-10-hydroxy-2,4a,6a,6a,9,14a-hexamethyl-11-oxo-1,3,4,5,6,6b,7,13,14,14b-decahydropicene-2-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C30H42O4
assistant