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Structures of the pyrrole alkaloid derivatives from Basidiomycetes-X. (A) 4-[2-formyl-5-(hydroxymethyl)-1H-pyrrol-1-yl] butanoic acid. (B) 4-[2-formyl-5-(hydroxymethyl)-1H-pyrrol-1-yl] butanamide. (C) 5-(hydroxymethyl)-1H-pyrrole-2-carboxaldehyde.
