This enzyme belongs to the family of oxidoreductases, specifically those acting on X-H and Y-H to form an X-Y bond with oxygen as acceptor. The systematic name of this enzyme class is sulochrin:oxygen oxidoreductase (cyclizing, (+)-specific). This enzyme is also called sulochrin oxidase.
Nordlov H, Gatenbeck S (1982). "Enzymatic synthesis of (+)- and (−)-bisdechlorogeodin with sulochrin oxidase from Penicillium frequentans and Oospora sulphurea-ochracea". Arch. Microbiol. 131 (3): 208&ndash, 11. doi:10.1007/BF00405880. PMID7049104.