8-phenylazoguanine
pyrimido[1,2-a]purin-10(3H)-one
3-{5-[bis-(4-methoxy-phenyl)-phenyl-methoxymethyl]-4-hydroxy-tetrahydro-furan-2-yl}-3H-1,3,4,5,8a-pentaaza-cyclopenta[b]naphthalen-9-one
1-[2-(allyloxy)-2-phenylethyl]-7-methyl-10-oxo-9,10-dihydropyrimido[1,2-a]purine
7-[2-(allyloxy)-2-phenylethyl]-2-aminopurin-6-one