You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-amino-9-[(6R,15R)-8-(6-aminopurin-9-yl)-9,12,18-trihydroxy-3-methyl-3,12-dioxo-2,4,7,11,13,16-hexaoxa-3lambda5,12lambda5-diphosphatricyclo[13.2.1.06,10]octadecan-17-yl]-1H-purin-6-one is given. What is its corresponding molecular formula?
user
C21H26N10O12P2
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