You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-O-(4-methoxy-16,18-dioxa-10-azapentacyclo[11.7.0.02,6.06,10.015,19]icosa-1(20),4,13,15(19)-tetraen-3-yl) 4-O-methyl 2-benzyl-2,3-dihydroxybutanedioate is the IUPAC name of a molecule. Please give its molecular formula.
user
C30H33NO9
assistant