You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(6aR,6bS,8aS,14bR)-N-cyclobutyl-8a-[hydroxy(methoxy)methyl]-4,4,6a,6b,11,11,14b-heptamethyl-3-oxo-2,4a,5,6,7,8,9,10,12,12a,14,14a-dodecahydro-1H-picene-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C36H57NO4
assistant