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3-{[9-(formylamino)-1,5,7,8-tetrahydroxy-9-(hydroxymethyl)-6-methylidene-5,7,8-tris(2-oxoethyl)-5,7,8,9-tetrahydro-6H-pyrrolo[1,2-a]indol-2-yl]amino}but-3-enoic acid related products: