Baeyer-Villiger oxidase; part of the gene cluster that mediates the biosynthesis of monodictyphenone, a prenyl xanthone derivative (PubMed:20139316, PubMed:21351751, PubMed:22730213). The pathway begins with the synthesis of atrochrysone thioester by the polyketide synthase (PKS) mdpG (PubMed:20139316). The atrochrysone carboxyl ACP thioesterase mdpF then breaks the thioester bond and releases the atrochrysone carboxylic acid from mdpG (PubMed:20139316). The atrochrysone carboxylic acid is then converted to atrochrysone which is further transformed into emodin anthrone (PubMed:20139316). The next step is performed by the anthrone oxygenase mdpH that catalyzes the oxidation of emodinanthrone to emodin (By similarity). Emodin is further modified to yield monodictyphenone via several steps involving mdpB, mdpC mdpJ, mdpK and mdpL (PubMed:20139316, PubMed:21351751). These enzymes with xptA, xptB and xptC are also proposed to be involved in the synthesis of shamixanthone from emodin (PubMed:22730213). Especially, direct reduction of emodin by the short chain dehydrogenase mdpC followed by dehydration catalyzed by the scytalone dehydratase-like protein mdpB gives loss of oxygen and formation of chrysophanol intermediate in two simple steps (PubMed:22730213). Secondary metabolite biosynthesis. Impairs the production of monodictyphenone, but still enables the synthesis of intermediates until emodin (PubMed:20139316, PubMed:21351751). Results in major accumulation of chrysophanol and its 6-hydroxymethyl shunt product aloe-emodin (PubMed:22730213). Belongs to the AflY oxidoreductase family. The predicted gene AN0152 has been split into 2 genes: ANIA_10044 and ANIA_10023.