You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5-[4-(3,5-dihydro-2H-[1,3]oxazolo[2,3-a]isoindol-4-ium-5-yloxy)pent-3-en-2-yloxy]-2,3-dihydro-[1,3]oxazolo[2,3-a]isoquinolin-4-ium by IUPAC nomenclature, provide its molecular formula.
user
C26H26N2O4+2
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