Direct heterocyclization of [3,4-dihydroisoquinolin-1(2H)-ylidene]acetamides with aroylketenes. Crystal and molecular structure of (Z)-3-(4a-methyl-1,3,4,4a,5,10b-hexahydrophenanthridin-6(2H)-ylidene)-4-phenylpyridine-2,6(1H,3H)-dione
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