You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[(1S,5R,6S,8R,9R,19R)-9-methoxy-4-methyl-8-(phenylmethoxymethyl)-18-oxa-4-azahexacyclo[11.6.1.01,6.05,12.09,19.017,20]icosa-13(20),14,16-trien-16-yl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C30H36N2O4
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