| Summary: | Three pyrrole alkaloid derivatives were isolated from the edible mushroom <i>Basidiomycetes-X</i> (Echigoshirayukidake) by water extraction followed by ethyl acetate fractionation. The chemical structures determined by MS and NMR were 4-[2-formyl-5-(hydroxymethyl)-1<i>H</i>-pyrrol-1-yl] butanoic acid (compound I), 4-[2-formyl-5-(hydroxymethyl)-1<i>H</i>-pyrrol-1-yl] butanamide (compound II), and 5-(hydroxymethyl)-1<i>H</i>-pyrrole-2-carboxaldehyde (compound III). Compound I was found to be the major component, followed by compound II, and compound III was the minor component. The dry powder of <i>Basidiomycetes-</i>X contained approximately 825 μg g<sup>−1</sup> compound I and 484 μg g<sup>−1</sup> compound II. Compound II was found to be a novel pyrrole aldehyde homologue not previously reported and thus is a specific component of this mushroom.
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