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

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

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

Ritalin molecule. Computer model of a molecule of the stimulant drug methylphenidate, marketed as Ritalin. 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 (grey), oxygen (red). "

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

Sec-butanol molecule. 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).

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

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). "

"Neostigmine 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). "

"Kanamycin antibiotic drug molecule (aminoglycoside). 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). "

"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). "

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

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

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

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

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

Kekulene hydrocarbon molecule, computer model. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white).