| ID | Symbol | Common_Name | Chemical_Formula | Nucleoside_Mass | Description |
| 25 | 1mC | 1-methylcytosine | C5H7N3O | 125.13 | A pyrimidone that is cytosine in which the hydrogen attached to the nitrogen at position 1 is substituted by a methyl group. |
| 26 | m2C | 2-O-methylcytosine | C5H7N3O | 125.13 | Pyrimidine substituted with a methoxy group at position C-2 and an amine group at C-4. |
| 27 | e3C | 3-ethylcytosine | C6H9N3O | 139.16 | A pyrimidone that is cytosine substituted by an ethyl group at position 3. |
| 28 | 3mC | 3-methylcytosine | C5H7N3O | 125.13 | A pyrimidone that is cytosine in which the hydrogen attached to the nitrogen at position 3 is substituted by a methyl group. |
| 29 | ɛC | 3,N4-ethenocytosine | C6H5N3O | 135.12 | |
| 30 | 4mC | 4-methylcytosine | C5H7N3O | 125.13 | A pyrimidone that is cytosine bearing an N(4)-methyl substituent. |
| 31 | 5caC | 5-carboxylcytosine | C5H5N3O3 | 155.11 | A nucleobase analogue that is cytosine in which the hydrogen at position 5 is replaced by a carboxy group. |
| 32 | 5fC | 5-formylcytosine | C5H5N3O2 | 139.11 | A nucleobase analogue that is cytosine in which the hydrogen at position 5 is replaced by a formyl group. |
| 33 | 5hmC | 5-hydroxymethylcytosine | C5H7N3O2 | 141.13 | A nucleobase analogue that is cytosine in which the hydrogen at position 5 is replaced by a hydroxymethyl group. |
| 34 | 5gmC | 5-glucosylmethylcytosine | C11H17N3O7 | 303.27 | A beta-D-glucoside derived from formal condensation of the hydroxy group of 5-(hydroxymethyl)cytosine with the anomeric hydroxy group of D-glucopyranose. |
| 35 | 5mC | 5-methylcytosine | C5H7N3O | 125.13 | A pyrimidine that is a derivative of cytosine, having a methyl group at the 5-position. |
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