You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
12-methoxy-20,26-dimethyl-14-oxa-2,4,6,17,20,23,26-heptazapentacyclo[26.3.1.13,7.19,13.119,22]pentatriaconta-1(31),3,5,7(35),9(34),10,12,19(33),21,28(32),29-undecaene-18,24-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C30H33N7O4
assistant