Used with
permission of Maiken Naylor, University at Buffalo, Buffalo, NY, USA,
http://ublib.buffalo.edu/libraries/units/sel/exhibits/stamps
This Swiss stamp and a similar one honoring Alfred Nobel himself were a joint issue of Sweden and Switzerland in 1997. Swiss chemist Paul Karrer's (1889-1971) research was in the chemistry of natural products, particularly carotinoids and flavins. He isolated vitamin A and determined its structure, the first vitamin so identified. Likewise, he identified vitamin B2 and was able to synthesize it. He shared the 1937 Nobel prize for chemistry with W. N. Haworth of England (see above, Royal Society of Chemistry).