English: Bradsher [4+2] cycloaddition between pyrido[1,2-b]isoquinolin-5-ium and malice anhydride in acetic acid, yielding the Diels-Alder product (6S,11R,12R,16R)-13,15-dioxo-6,11-dihydro-6,11-[3,4]furanopyrido[1,2-b]isoquinolin-5-ium. ChemDraw image with 1996 ACS specifications.
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