You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[3-[(2S,8R,11S)-8-[(4-aminophenyl)methyl]-11-[(4-hydroxyphenyl)methyl]-3,6,9,12-tetraoxo-1,4,7,10-tetrazacyclododec-2-yl]propyl]guanidine by IUPAC nomenclature, provide its molecular formula.
user
C26H34N8O5
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