1,7-Dimethyl-3-propyl-3,7-dihydro-purin-2,6-dion

2-methyl1,2,3,4-tetrahydroquinoline

2-methyl-3-methylsulfanylquinoxaline

1-benzyl-3-methylquinoxalin-2-one

4-methyltetrazolo[1,5-a]quinoxaline