Fenethylline-d4 Hydrochloride 3,7-Dihydro-1,3-diMethyl-7-[2-[(1-Methyl-2-phenylethyl)aMino]ethyl-d4]-1H-purine-2,6-dione Hydrochloride 7-[2-(1-Methyl-2-phenylethylaMino)ethyl-d4]theophylline Hydrochloride 7-[2-[(α-Methylphenethyl)aMino]ethyl-d4]theophylline Hydrochloride AMfetyline-d4 Hydrochloride Biocapton-d4 Captagon-d4 Hydrochloride H 814-d4