1	ZGP	5'-O-[(R)-hydroxy{[2-hydroxy-3,5-dimethyl-6-(2-oxo-2-sulfanylethyl)pyridin-4-yl]oxy}phosphoryl]guanosine	1.000
2	I2C	5'-O-[(S)-hydroxy{[2-hydroxy-3,5-dimethyl-6-(2-oxoethyl)pyridin-4-yl]oxy}phosphoryl]guanosine	0.973
3	FEG	5'-O-[(S)-{[2-(carboxymethyl)-6-hydroxy-3,5-dimethylpyridin-4-yl]oxy}(hydroxy)phosphoryl]guanosine	0.947
4	YGP	5'-O-[(R)-[(3,6-dimethyl-2-oxo-1,2-dihydropyridin-4-yl)oxy](hydroxy)phosphoryl]guanosine	0.892
5	FE9	Iron-guanylyl pyridinol cofactor	0.857