 |  |  |
| 16800000 | Rabenzazole Rabenzazole (BSI,ISO) | 40341-04-6 |
| 16804000 | Rabeprazole Rabeprazole|LY-307640|Pariprazole|Pariet|Aciphex|117976-90-6 for sodium salt | 117976-89-3 |
| 16805000 | Ractopamine hydrochloride Ractopamine hydrochloride|EL737|LY031537|LYO31537|Paylean®|99095-19-9|128954-46-1 | 90274-24-1 |
| 16805200 | Rafoxanide Rafoxanide | 22662-39-1 |
| 16806000 | D-(+)-Raffinose pentahydrate D-(+)-Raffinose pentahydrate|Melitose|Melitriose | 17629-30-0 |
| 16809000 | Reactive Black 5 Reactive Black 5 | 17095-24-8 |
| 16809010 | Reactive Blue 19 Reactive Blue 19|Remazol Brilliant Blue R|CI61200 | 2580-78-1 |
| 16809050 | Reactive Orange 16 Reactive Orange 16|CI42040 | 20262-58-2 |
| 16809100 | Reactive Violet 5 (technical) Reactive Violet 5||CI18097|KN-4R|Remazol Brilliant Violet 5R | 12226-38-9 |
| 16810000 | Resmethrin Resmethrin (BSI,ISO,ANSI,ESA,JMAF)|Chryson|Synthrin | 10453-86-8 |
| 16810010 | Resmethrin-alcohol metabolite Resmethrin-alcohol metabolite|Resmethrin alcohol metabolite | 20416-09-5 |
| 16811200 | Resorcinol (Resorcin) Resorcinol|Resorcin|1,3-Dihydroxybenzene | 108-46-3 |
| 16811600 | trans-Resveratrol trans-Resveratrol | 501-36-0 |
| 16812000 | Retene Retene|7-Isopropyl-1-methylphenanthrene|R | 483-65-8 |
| 16813000 | RH 5849 RH 5849|RH5849|RH-5849 | 112225-87-3 |
| 16813500 | L(+)-Rhamnose hydrate L(+)-Rhamnose hydrate | 10030-85-0 |
| 16813550 | Rhodamine B chloride Rhodamine B chloride|Basic Violet 10|Rhodamine O|Brilliant Pink B|Tetraethylrhodamine | 81-88-9 |
| 16813570 | Ribavirin Ribavirin|Icn-1229|Ribamidyl|RTCA|Viramid|Virazole | 36791-04-5 |
| 16813600 | (-)-Riboflavin (Vitamin B2) (-)-Riboflavin|(-)-Lactoflavin|Vitamin B2 | 83-88-5 |
| 16813610 | Riboflavine-5´-phosphate sodium Riboflavine-5´-phosphate sodium|Vitamin B2 phosphate sodium | 130-40-5 |
| 16813700 | D(-)-Ribose D(-)-Ribose|D(-)-Ribofuranose | 50-69-1 |
| 16813800 | Ribostamycin sulfate salt Ribostamycin sulfate salt | 53797-35-6 |
| 16814020 | Ricinelaidic acid-methyl ester Ricinelaic acid-methyl ester|Methyl ricinelaidate | 7706-01-6 |
| 16814070 | Ricinoleic acid-methyl ester Ricinoleic acid-methyl ester|Methyl ricinoleate|(R)-12-Hydroxy-cis-9-octadecenoic acid methyl ester | 141-24-2 |
| 16814500 | Rifampicin Rifampicin|RifampinRifamycin | 13292-46-1 |
| 16814600 | Rifamycin SV sodium salt hexahydrate Rifamycin SV sodium salt hexahydrate|Sodium rifomycin SV | 14897-39-3 |
| 16814700 | Rifaximin Rifaximin|Rifamycin SV|Rifacol|XIFAXAN|Normix | 80621-81-4 |
| 16815000 | Rimsulfuron Rimsulfuron|DPX-E9636|Titus | 122931-48-0 |
| 16815090 | Rimsulfuron Metabolite 2 Rimsulfuron Metabolite 2 | . |
| 16815400 | Robenidine hydrochloride Robenidine hydrochloride|Khimroside|Robeniden|Cycostat | 25875-50-7 |
| 16815500 | Ronidazole Ronidazole|Ronidazol | 7681-76-7 |
| 16815501 | Ronidazole D3 Ronidazole D3|Ronidazol D3 | . |
| 16820000 | Rotenone Rotenone (BSI,ISO,ESA)|Derris (JMAF)|Chem Sect|Cuberoot|Noxfire|Prenfish|Synpren fish|Derris | 83-79-4 |
| 16820200 | Roxarsone Roxarsone|4-Hydroxy-3-nitrobenzenearsonic acid|2-Nitrophenol-4-arsonic acid|Roxarson | 121-19-7 |
| 16860000 | Roxithromycin Roxithromycin|Biaxsig|Rulide|Rulide D | 80214-83-1 |
| 16880000 | Rutin hydrate Rutin hydrate|Vitamin P hydrate| | 153-18-4 |