You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (15E,17Z)-5-cyclohexyl-17-ethenyl-8-(hydroxymethyl)-7-methyl-18-[(Z)-prop-1-enyl]-1-oxa-4,7,10,13-tetrazacyclooctadeca-15,17-diene-6,9,12-trione by IUPAC nomenclature, provide its molecular formula.
user
C26H40N4O5
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