adenosine
alkaloid
atom
atomic
caffeinated
caffeine
cage
carbon
chemical
chemical structure
chemistry
coffee
cola
compound
decaffeinated
dependence
education
formula
guarana
guaranine
hydrogen
illustration
intoxication
kola
methyltheobromine
molecular
molecule
notebook
oxygen
schematic
science
sheet
stimulant
structural formula
structure
study
tea
xanthine
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