You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
10,13-dimethyl-17-(7-phenyl-[1,2]oxazolo[3,4-d]pyridazin-4-yl)-1,2,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-3-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C30H33N3O2
assistant