Medical

Deoxyribonucleic Acid (DNA) Chymotrypsin (a digestive protein)
Aspirin     (Acetyl Salicylic Acid) Streptomycin   (an antibiotic)
Sulphanilamide (an antibiotic) Morphine  (a narcotic pain-killer)
Ibuprofen (an OTC Pain-killer) Paracetamol  (Acetominophen another OTC pain-killer)
Adrenaline  Estradiol  (Estrogen)
Testosterone Beta-Carotene from carrots (eye-sight)
Vitamin A  Almost exactly 1/2 of the B-Carotene

Household

Mothballs (Para-dichloro-benzene) Suntan Lotion Sunblock (p-amino-benzoic acid)
Stimulants and Depressants

 THC  (Tetrahydrocannabinol, the active             ingredient in marijuana) Caffeine
Nicotine  Baribituric Acid
Amphetamine Cocaine
Explosives

Nitroglycerin TNT (2,4,6-tri-nitro-toluene)
Preservatives

BHT  (butylated hydroxy toluene) BHA (butylated hydroxy anisole)
Weed and Pest Killers

DDT (2,2,2-trichloro-1,1-bis-(4-chlorophenyl)-ethane 2,4,5-T
2,4-D

Dioxins

2,3,7,8-tetrachloro-dioxin PCB's (Poly Chlorinated BiPhenyl's)