8-chlo·ro·the·oph·yl·line 
(ātklô′rə-thē-ŏfə-lĭn)
(ātklô′rə-thē-ŏfə-lĭn)n.
A stimulant, C7H7N4O2Cl, that is used to form a salt with certain pharmaceutical drugs, such as diphenhydramine.
[8-, conventional numbering of the position in the compound's purine ring to which the chlorine atom is attached + CHLORO- + THEOPHYLLINE.]