Ecstasy 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).

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

"Prednisolone corticosteroid drug 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).

Methanol molecule, computer artwork. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white) and oxygen (red).

"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). "

Cyclohexane molecule in its boat conformational form. Atom are represented as spheres and are colour-coded: carbon (black) and hydrogen (white).

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

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

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

"Suramin sleeping sickness drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (black), oxygen (red), nitrogen (blue), sulfur (yellow). "

"Suramin sleeping sickness drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (black), oxygen (red), nitrogen (blue), sulfur (yellow). "

"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). "

"Norethisterone enanthate (norethindrone aenanthate) injectable contraceptive drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (black), oxygen (red). "

"Chlorocresol (p-chlorocresol) antiseptic and preservative molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (black), oxygen (red), chlorine (green). "

"Lumefantrine (benflumetol) antimalarial drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (black), oxygen (red), nitrogen (blue), chlorine (green). "

"Lenvatinib cancer drug molecule (multi-kinase inhibitor). Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (black), oxygen (red), nitrogen (blue), chlorine (green). "

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

"Safinamide Parkinson's disease drug molecule. Atoms are represented as spheres with conventional colour coding: hydrogen (white), carbon (black), oxygen (red), nitrogen (blue), fluorine (light green). "

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

Propane molecule. Atoms are represented as spheres and are colour-coded: carbon (black) and hydrogen (white).