32 UNITY AND DIVERSITY IN BIOCHEMISTRY 



Table VII 

 Natural carotenoids whose structure is known 



(Karrer and Jucker) 



CHa CHs CH« CHs 



\ / \ / 



C CHo CHa CHa CHs C 



/ I I I I \ 



CH CHCH = CHC=CHCH = CHC=:CHCH = CHCH=C-CH=CHCH = C-CH=:CHCH CH 



I II II I 



CH, CCH, H,CC CH, 



\ y I.ycopene \ / 



CH, CHi 



CH, CH, CH, CHg 



\ / \ / 



C CH, CH; CHs CHa C 



/ I I I I / \ 



CH CHCH=:CHC=CHCH = CHC=CHCH = CHCH=CCH=CHCHrrCCH = CHC CH, 



I II II I 



CH, CCH, H.CC CH. 



X y Y-Carotene \ y 



CH, CH, 



CHi CHj CHj CH» 



\ / \ / 



C CHi CH. CH, CH, C 



/ \ I I I I / \ 



CH, CCH = CH-C = CHCH = CHC = CHCH = CHCH=CCH=:CHCH=CCH=CHC CH, 



I II ' II I 



CH, CCH, H,CC CH, 



\ / B-Carotene \ / 



CH, CH, 



CH, CH. CH, CHs 



\ / \ / 



C CH, CH, CH. CHa C 



/ \ I I I I / \ 



CH, CCH = CHC=CHCH = CHC = CHCH=zCHCH = C CH = CHCH=C CH = CHCH CH: 



I II II 



CH, CCH, H,C C CHj 



\ / a-Carolene ^ / 



CH, CH 



CH, CH. "^ 



\ / 

 , V CHs CH» 



CH, C:=CHCH, CH3 CH, CH, ^C^ 



III! I I I / \ 



CH, C CH C=CHCH = CHC=CHCH = CHCH = C CH = CHCH = C CHrrCHC CH, 



\ / \ / II I 



^"' u° "^C C CH, 



CH. \ / 



CH, 



Mutatochrome, Citroxanthin 



