Goodwin2 isolated two carotenoids from photosynthetic bacteria which were named P481 and OH-P48La OH-P481 appeared to be identical with rhodovibrin described by Karrer, et aL4" On the basis of the structural relationship existing between OH-P481 and P481, the name anhydrorhodovibrin was suggested for P481.'v8 A study of the chemical constitution of these carotenoids led to the suggested structure V or Vb for rhodovibrin and VI11 or VIIIb ...
