• 1-beta-Arabinofuranosylcytosine see Cytarabine
• 2-Amino-6-mercaptopurine see Thioguanine
• 2-Br-alpha-ergocryptine see Bromocriptine
• 2-Bromoergocryptine see Bromocriptine
• 2-CdA see Cladribine Injection
• 2-Chloro-2'-deoxyadenosine see Cladribine Injection
• 2-Fluoro-ara-A Monophosphate, 2-Fluoro-ara AMP, FAMP see Fludarabine Injection
• 2'-Deoxycoformycin see Pentostatin Injection
• 3TC see Lamivudine
• 3TC and azidothymidine see Lamivudine and Zidovudine
• 3TC and AZT see Lamivudine and Zidovudine
• 3TC and TDF see Lamivudine and Tenofovir
• 3TC and ZDV see Lamivudine and Zidovudine
• 4-aminopyridine see Dalfampridine
• 4-AP see Dalfampridine
• 5-ASA see Mesalamine Rectal
• 5-ASA see Mesalamine
• 5-Fluorouracil see Fluorouracil Topical
• 5-Fluorouracil see Fluorouracil Injection
• 5-formyl tetrahydrofolate see Leucovorin Injection
• 5-formyl tetrahydrofolate see Leucovorin
• 5-FU see Fluorouracil Topical
• 5-FU see Fluorouracil Injection
• 6-MP see Mercaptopurine
• 6-TG see Thioguanine
• 6-Thioguanine see Thioguanine