You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (Z)-4-[4-[[26,28-dihydroxy-27-[4-[[(Z)-4-oxopent-2-en-2-yl]amino]butoxy]-25-pentacyclo[19.3.1.13,7.19,13.115,19]octacosa-1(25),3(28),4,6,9(27),10,12,15,17,19(26),21,23-dodecaenyl]oxy]butylamino]pent-3-en-2-one by IUPAC nomenclature, provide its molecular formula.
user
C46H54N2O6
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