1 1FQ (2z,5e)-6-[4-(4-fluorobenzoyl)-1h-pyrrol-2-yl]-2-hydroxy-4-oxohexa-2,5-dienoic acid 1.000 2 1FO 6-[4-(3-fluorobenzoyl)-1h-pyrrol-2-yl]-2-hydroxy-4-oxohexa-2,5-dienoic acid 0.920