1-(3-Cytosinyl)-2-(1-guanyl)ethane 1-CGE 126175-83-5 2-Amino-1-(2-(3,6-dihydro-6-imino-2-oxo-1(2H)-pyrimidinyl)ethyl)- 1,7-dihydro-6H-purin-6-one 6H-Purin-6-one, 2-amino-1-(2-(3,6-dihydro-6-imino-2-oxo-1(2H)-pyrimidinyl)ethyl)- 1,7-dihydro-