You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4aR,6aR,6aS,6bR,8aS,11R,12S,12aS,14bS)-4,4,6a,6b,11,12,14b-heptamethyl-3,13-dioxo-8a-(2-oxo-1,3-oxazolidin-3-yl)-5,6,6a,7,8,9,10,11,12,12a-decahydro-4aH-picene-2-carbonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C33H44N2O4
assistant