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ABSTRACT Tropolonoids are important natural products that contain a unique seven-membered aromatic tropolone core and exhibit… Expand The first successful preparation of mono- and disubstituted 3,7-dihydroxytropolone involves a four-step synthetic scheme. Thus… Expand A new antitumor antibiotic BMY-28438 was isolated from the cultured broth of Streptomyces tropolofaciens No. K611-97. The… Expand