You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 22-(6-phthalazin-1-ylnaphthalen-2-yl)-8-thia-22-azaheptacyclo[13.6.1.04,20.07,19.09,18.012,17.016,21]docosa-1,3,5,9(18),10,12(17),14,16(21),19-nonaene by IUPAC nomenclature, provide its molecular formula.
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C38H21N3S
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