| Label | Id | |
|---|---|---|
| 4,5-diamino-1,2,4a,4b,7,8,8a,8b-octahydro-1,3,6,8-tetraazabiphenylene-2,7-dione | http://purl.obolibrary.org/obo/CHEBI_116510 | |
| 4,5-diamino-1,4a,4b,8,8a,8b-hexahydrocyclobuta[1,2-d:4,3-d']dipyrimidine-2,7-dione | http://purl.obolibrary.org/obo/CHEBI_116510 | |
| cytosine dimer | http://purl.obolibrary.org/obo/CHEBI_116510 | |
| cyclobutane cytosine dimer | http://purl.obolibrary.org/obo/CHEBI_116510 |