You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-[(1R,6R,8R,9R,10S,15R,17R,18R)-17-(2-amino-6-oxo-1H-purin-9-yl)-9,12,18-trihydroxy-3-oxo-3-sulfanyl-12-sulfanylidene-2,4,7,11,13,16-hexaoxa-3lambda5,12lambda5-diphosphatricyclo[13.2.1.06,10]octadecan-8-yl]-5-chloroquinazolin-4-one by IUPAC nomenclature, provide its molecular formula.
user
C23H24ClN7O12P2S2
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