• Reductase,sulfite
• 37256-51-2
• .

• Reductase,enoyl- [acyl carrier protein]
• 37251-08-4
• .

• Reductase,thymidine diphospho-4-ketorhamnose
• 37250-64-9
• .

• Reductase,glyoxylate (reduced nicotinamide adenine dinucleotide phosphate)
• 37250-17-2
• .

• Retinoid 7901
• 81626-28-0
• .

• Ro 22-8181
• 93354-90-6
• .

• r-Serratane
• 18046-87-2
• .

• Raunescic acid
• 482-86-0
• .

• Rhynchophine
• 84638-29-9
• .

• Riccardin C
• 84575-08-6
• .

• Retinoic acid,4-hydroxy-
• 73366-04-8
• .

• Rewoteric AMVSF
• 73337-95-8
• .

• Rose Bengal, labeled with iodine-125
• 73296-61-4
• .

• RDA 1020
• 84287-34-3
• C₄₈H₅₈N₄O₁₁S₃
• 963.18932
• .

• Rubaferinin
• 70476-16-3
• .

• R 24191
• 53028-09-4
• .

• Rudbeckianone
• 70329-65-6
• .

• Racemase,aspartate
• 37237-56-2
• .

• Ranibizumab [USAN]
• 347396-82-1
• .

• RV 1208
• 34332-53-1
• C₁₉H₁₄ClN₂NaO₅
• 408.76763
• .

• RV 1210
• 34332-52-0
• C₁₉H₁₄ClN₂NaO₅
• 408.76763
• .

• Rika HPO 80
• 70640-72-1
• .

• Rhodamine B, turkey red oil precipitate
• 68513-60-0
• .

• Ro 4-9040
• 5093-97-0
• .

• RG 1812
• 37139-68-7
• .

• rhIGF-I/rhIGFBP-3
• 478166-15-3
• .

• R 093877
• 179474-80-7
• .

• RX 684100
• 34645-87-9
• .

• Rosin, fumarated, reaction products with N-(4-((4-(diethylamino)phenyl)(4-(ethylamino)-1-naphthalenyl)methylene)-2,5-cyclohexadien-1-ylidene)-N-ethylethanaminium chloride and sodium dodecyl sulfate
• 73018-38-9
• .

• Ranaconine
• 70474-32-7
• .

• r-Safranic acid
• 70416-88-5
• .

• Reductone X
• 81525-11-3
• .

• r-D-Idopyranose
• 7282-82-8
• .

• Roncovite
• 50933-70-5
• .

• Reslin
• 50933-56-7
• C₄₁H₅₆O₈
• 676.87854
• .

• Resolin Yellow Brown GLS
• 50922-61-7
• .

• RPHJ 17
• 50822-55-4
• .

• R 39611
• 72570-68-4
• .

• Rohituka 3
• 70266-36-3
• C₃₂H₄₀O₁₁
• 600.6534
• .

• Rosin, fumarated, polymer with formaldehyde, pentaerythritol and 4-(1,1,3,3-tetramethylbutyl)phenol
• 70248-45-2
• .

• r-Trihomofarnesene
• 70239-70-2
• .

• Rosin, polymer with p-tert-butylphenol, formaldehyde, isophthalic acid and pentaerythritol
• 70025-26-2
• .

• Retinoic acid, mixt with methyl 7-chloro-6,7,8-trideoxy-6-((((2S,4R)-1-methyl-4-propyl-2-pyrrolidinyl)carbonyl)amino)-1-thio-L-threo-alpha-D-galacto-octopyranoside 2-(dihydrogen phosphate)
• 337954-93-5
• .

• Rosin, polymer with p-tert-butylphenol, formaldehyde, glycerol, phenol, phthalic anhydride and tall oil
• 72480-63-8
• .

• RU 4159
• 58546-51-3
• .

• r-Oxymesoferriheme
• 33570-13-7
• .

• Ro 15-9268
• 92928-45-5
• C₂₃H₂₈N₆S
• 420.57362
• .

• RMI 61205
• 56972-87-3
• C₂₆H₂₂N₂O₃
• 410.46448
• .

• Rauniticine oxindole A
• 17507-91-4
• .

• Rosin modified phenol, formaldehyde, tung oil, lactic acid, glycerin, phthalic anhydride polymer
• 68458-69-5
• .