You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 9H-fluoren-9-ylmethyl N-[6-[[(2S)-1-[[(2S)-1-[2-[[2-[4-(2,6-dioxo-1,3-dipropyl-7H-purin-8-yl)phenoxy]acetyl]amino]ethylamino]-3-hydroxy-1-oxopropan-2-yl]amino]-3-(4-hydroxyphenyl)-1-oxopropan-2-yl]amino]-6-oxohexyl]carbamate by IUPAC nomenclature, provide its molecular formula.
user
C54H63N9O11
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