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This paper describes an efficient synthetic route to pentalongin (1H-naphtho[2,3-c]pyran-5,10-dione), a naphthoquinoid isolated from the aerial parts of Mitracarpus scaber, and to the structurally-related compound psychorubrin(3-hydroxy-1H-3, 4-dihydronaphtho[2,3-c]pyran-5,10-dione).
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Pialat et al. (1998) studied this question.
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