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I 1599 (OTTO) 3-Isochromanone, 98% Cas 4385-35-7 - used as starting reagent in the synthesis of of BDPBI (7-bromo-1,4-dihydro-2-phenyl-4,4-bis(4-pyridinylmethyl)2H-isoquinolin-3-one dihydrochloride).