You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [(1S,4R,5R,21R,26S,41R)-9-amino-5-[2-[2-(ethylamino)phenyl]ethyl]-17,36-dihydroxy-34-methoxy-21-(methylamino)-19,27-dioxa-10-azanonacyclo[26.11.1.11,4.126,29.06,11.015,25.018,24.032,40.033,38]dotetraconta-6(11),7,9,15,17,22,24,28,30,32(40),33(38),34,36-tridecaen-12-yn-41-yl]methyl acetate by IUPAC nomenclature, provide its molecular formula.
user
C54H56N4O7
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