1,3-dimethyl-6,7-dihydropurin-2-one

[5-acetamido-3-(1,3-dimethyl-2,6-dioxopurin-7-yl)-6-methoxy-3,6-dihydro-2H-pyran-2-yl]methyl acetate

[5-acetamido-3-(1,3-dimethyl-2,6-dioxopurin-7-yl)-6-methoxy-3,6-dihydro-2H-pyran-2-yl]methyl acetate

7-(methyl 2-acetamido-6-O-acetyl-2,3,4-trideoxy-β-D-erythro-hex-2-enopyranosid-4-yl)theophylline

7-(2-acetamido-4,6-di-O-acetyl-2,3-dideoxy-D-threo-hex-2-enopyranosyl)theophylline