We find that the product from the interaction of 6,7-dimethoxy-3-isochromanone and hydrazine, followed by treatment of the intermediate hydrazide with mineral acid, is not 6,7-dimethoxy-1,3-dihydro-3-(2H)isoquinolone as stated in the literature, but rather bis-2,2-(6,7-dimethoxy-1,4-dihydro-3(2H)isoquinolonyl). An explanation of the formation of this product is provided.