preferred_name: [(2R,3S,4R,5R)-5-(4-acetonyl-3-carbamoyl-pyridin-1-ium-1-yl)-3,4-dihydroxy-tetrahydrofuran-2-yl]methyl [[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxy-tetrahydrofuran-2-yl]methoxy-hydroxy-phosphoryl] phosphate