methyl 1-hydroxy-4-(1-hydroxy-3-oxo-1H,3H-naphtho[1,8-cd]pyran-1-yl)-2-naphthoate;1-Hydroxy-4-(1-hydroxy-3-oxo-1H,3H-naphtho[1,8-cd]pyran-1-yl)-2-naphthalenecarboxylic acid methyl ester
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