prov:value
| - wherein n=0 or 1; Y is selected from the group consisting of an oxygen of the carboxyl of a natural or unnatural amino acid, an amino group of a natural or unnatural amino acid, or the C-5??? oxygen group of a natural or unnatural deoxyribonucleic or ribonucleic acid; R1 and R2 independently are a hydrogen atom, a lower alkyl, aryl, benzyl, halogen, hydroxyl, alkoxyl, thiol, thioether, amino, nitr
|