3d image of caffeine skeletal formula

caffeine central nervous system cns stimulant methylxanthine class theine methyltheobromine guaranine trimethylxanthine cognitive enhancer performance adenosine neurotransmitter acetylcholine cyclic amp phosphodiesterase coffee honey bees coffee bean coffea plant beverages tea cola psychoactive drug dope doping psychostimulant performance-enhancing ped bronchopulmonary dysplasia apnea prematurity parkinson's disease sleep disruption anxiety drug dependence withdrawal symptoms safe drip percolation espresso dietary supplement biological activity bioactive food additive nutraceutica dietary 3d