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Name the molecular formula for the molecule established as 5-[6-(3,4-dihydropyridin-6-yl)-2,10'a-dimethylspiro[1,2,5,6-tetrahydroxanthene-9,9'-5,6,7,9a-tetrahydro-4aH-xanthene]-3'-yl]-1,2-dihydro-[1]benzothiolo[2,3-b]pyridine using the IUPAC nomenclature.
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C43H42N2O2S
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