4-aminosalicylic acid, isoniazid, and ethionamide comparison

All are used to treat tuberculosis. All have a keto (thioketone in one case) group, an amino group, and a 6-sided ring. I suspect there are other potential tuberculosis drugs that have the same functional groups. 

chronology of common anesthetics

Once the first two were discovered and analyzed, there was a gradual push to combine them and make different asymmetrical halogenated ethers. The last one is a somewhat asymmetrical ester salt. I suspect another anesthetic could be made by chlorinating and/or fluorinating diethyl ether.  

19th century 

20th century

melphalan, ifosfamide, bendamustine, and cyclophosphamide comparison

All are chemotherapy drugs, and all have two chloroethyl chains coming off nitrogen atoms. I suspect there are similar drugs yet to be synthesized. 

baron samedi

 

meaning of life

 

nature is the best teacher

 

tegafur and gemcitabine comparison - fluorouracil cousins

They're both chemotherapy drugs related to fluorouracil.

Derpetology: fluorouracil and its cousins (fluoropyrimidine)