Serendipity.
Scoville
A B
AB
D004739:England; D049673:History, 20th Century; D010406:Penicillins / Q000266:history; D004364:Pharmaceutical Preparations / Q000266:history*; D012106:Research / Q000266:history*; D013449:Sulfonamides / Q000266:history; D014481:United States
D010406:Penicillins; D004364:Pharmaceutical Preparations; D013449:Sulfonamides