Scandium(III) fluoride, ScF₃, is an ionic compound.

Scandium(III) sulfide (Sc₂S₃) is a chemical compound.

Samarium(II) chloride (SmCl₂) is a chemical compound.

S-Allyl cysteine (SAC) is an organic compound that is a natural constituent of fresh garlic. It is a derivative of the amino acid cysteine in which an allyl group has been added to the sulfur atom.

Selenium hexasulfide (Se₂S₆) is a chemical compound.

Selenium oxybromide (SeOBr₂) is a chemical compound.

Sesamol is a natural organic compound which is a component of sesame oil. It is a white crystalline solid that is a derivative of phenol. It is sparingly soluble in water, but miscible with most oils.

Rosmarinic acid, C₁₈H₁₆O₈, is a natural polyphenol antioxidant carboxylic acid found in many Lamiaceae herbs used commonly as culinary herbs such as rosemary, oregano, sage, thyme and peppermint. Chemically, rosmarinic acid is a dimer of caffeic acid. It is a red-orange powder that is slightly soluble in water, but well soluble is most organic solvents.

Rhodium(III) oxide (Rh₂O₃) is a chemical compound.

Propylene glycol dinitrate (PGDN, 1,2-propylene glycol dinitrate, or 1,2-propanediol dinitrate) is an organic chemical, an ester of nitric acid and propylene glycol. It is structurally similar to nitroglycerin, except that it has one fewer -O-NO₂ group. It is a characteristically and unpleasantly smelling colorless liquid, which decomposes at 121 °C, below its boiling point. It is flammable and explosive. It is shock-sensitive.