Substituted xanthines

Compound	Structure
Uric acid
Paraxanthine
Theobromine
Theophylline
Caffeine
8-Chlorotheophylline (8-CTP)
1-Propargyltheobromine (DMPX)
Isobutylmethylxanthine (IBMX)
8-Cyclopentyltheophylline (CPX)
Diprophylline
8-Phenyltheophylline
8-Bromotheophylline (8-BTP)
Dipropylcyclopentylxanthine (DPCPX)
Propentofylline (HWA 285, HWA-285)
Dimenhydrinate