Three pyranonaphthazarin pigments from Gnomonia erythrostoma

Abstract
Three pigments produced by Gnomonia erythrostoma have been shown to be 2-acetonyl-4-hydroxy-8-methoxydihydropyrano[3,2-g]naphthazarin (I), its 4-deoxy-derivative (II), and 2-(2′-hydroxy-n-propyl)-8-methoxydihydropyrano[3,2-g]naphthazarin (III) or the corresponding 7-methoxy-isomers.

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