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Retinol Palmitate

Retinol palmitate is the ester of retinol and palmitic acid. It is used as an antioxidant and a source of vitamin A added to low fat milk and other dairy products to replace the vitamin content lost through the removal of milk fat. Palmitate is attached to the alcohol form of vitamin A, retinol, in order to make vitamin A stable in milk. Retinyl palmitate is also a constituent of some topically applied skin care products. After its absorption into the skin, retinyl palmitate is converted to retinol, and ultimately to retinoic acid.

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Retinyl Acetate

Retinyl Acetate is used for vitamin A deficiency and as an antiaging chemicals.

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Rhapontin

Rhaponticin is a stilbene glucoside compound. Its aglycone metabolite is called rhapontigenin. It can be found in rhubarb rhizomes. It has beneficial effects on diabetic mice, and in vitro results suggest it may be relevant to Alzheimer's disease with an action on beta amyloid.

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Rhein

Rhein is a substance in the anthraquinone group found in rhubarb species like Rheum undulatum or Rheum palmatum or in Cassia reticulata. It has been reevaluated as a new antibacterial agent against Staphylococcus aureus in 2008.

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Ribavirin

Ribavirin is an anti-viral drug indicated for severe RSV infection, hepatitis C infection (used in conjunction with peginterferon alfa-2b or peginterferon alfa-2a) and other viral infections. Ribavirin is a prodrug, which when metabolized resembles purine RNA nucleotides. In this form it interferes with RNA metabolism required for viral replication.

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Riboflavin

Riboflavin is an easily absorbed micronutrient with a key role in maintaining health in humans and other animals. It is the central component of the cofactors FAD and FMN, and is therefore required by all flavoproteins. It is widely used as food and feed additives. Riboflavin has been used in several clinical and therapeutic situations. It has also been used as a muscle pain reliever. Because riboflavin is fluorescent under UV light, dilute solutions are often used to detect leaks or to demonstrate coverage in an industrial system such as chemical blend tank or bioreactor.

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Ribothymidine

Ribothymidine is used as drug intermediate.

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Rifaximin

Rifaximin is a semisynthetic, rifamycin-based non-systemic antibiotic, meaning that the drug will not pass the gastrointestinal wall into the circulation as is common for other types of orally administered antibiotics. It is used to treat diarrhea caused by E. coli.Rifaximin is a product of synthesis of rifamycin, an antibiotic with low gastrointestinal absorption and good antibacterial activity. It acts on the beta-subunit of the deoxyribonucleic acid (DNA)-dependent ribonucleic acid (RNA) polymerase enzyme of microorganisms to inhibit RNA synthesis.

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Rilmazafone

Rilmazafone is a benzodiazepine prodrug developed in Japan. It has sedative and hypnotic effects. It induces impairment of motor function and has hypnotic properties.

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