Ecstasy drug molecule. Atoms are represented as spheres and are colour-coded: carbon (black), hydrogen (white), nitrogen (blue) and oxygen (red).

Morphine drug molecule. Atoms are represented as spheres and are colour-coded: carbon (black), hydrogen (white), nitrogen (blue) and oxygen (red).

Heroin drug molecule. Atoms are represented as spheres and are colour-coded: carbon (black), hydrogen (white), nitrogen (blue) and oxygen (red).

Serotonin neurotransmitter molecule. Atoms are represented as spheres and are colour-coded: carbon (black), hydrogen (white), nitrogen (blue) and oxygen (red).

Doxycycline antibiotic, molecular model. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), nitrogen (dark blue) and oxygen (red).

Fructose sugar molecule. This is the ring structure. Atoms are represented as spheres and are colour-coded: carbon (black), hydrogen (white) and oxygen (red).

Carisoprodol muscle relaxant, molecular model. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), oxygen (red) and nitrogen (blue).

"Maltodextrin food additive molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (black), oxygen (red). "

Glucose sugar molecule. This is the ring structure. Atoms are represented as spheres and are colour-coded: carbon (black), hydrogen (white) and oxygen (red).

Donepezil Alzheimer's drug, molecular model. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), oxygen (red) and nitrogen (blue).

"Prednisolone corticosteroid drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (black), oxygen (red). "

Cetirizine antihistamine, molecular model. Atoms are represented as spheres and are colour-coded; carbon (grey), hydrogen (white), nitrogen (blue), oxygen (red) and chlorine (green).

"Neostigmine drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (grey), oxygen (red), nitrogen (blue). "

"Pendimethalin herbicide molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (black), oxygen (red), nitrogen (blue). "

"Primaquine malaria drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (black), oxygen (red), nitrogen (blue). "

"Paromomycin aminoglycoside antibiotic drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (grey), oxygen (red), nitrogen (blue). "

"Primaquine malaria drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (grey), oxygen (red), nitrogen (blue). "

"Tropicamide mydriatic eye drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (grey), oxygen (red), nitrogen (blue). "

"Indacaterol COPD drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (grey), oxygen (red), nitrogen (blue). "

"Paromomycin aminoglycoside antibiotic drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (black), oxygen (red), nitrogen (blue). "

"Paromomycin aminoglycoside antibiotic drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (grey), oxygen (red), nitrogen (blue). "

"Tetracaine local anesthetic drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (grey), oxygen (red), nitrogen (blue). "

"Indacaterol COPD drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (grey), oxygen (red), nitrogen (blue). "

"Primaquine malaria drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (grey), oxygen (red), nitrogen (blue). "

Water molecules. Atoms are represented as spheres and are colour-coded: oxygen (red) and hydrogen (white).