Impurities A.R H,CO-CHa:kitols (Diels-Alder dimers of vitamin A), H3C CH3 CH3 CH3 CH2 CH3
Impurities A.R = H, CO-CH3: kitols (Diels-Alder dimers of vitamin A)
B,(3E,5E,7)-3,7-dimethyl-9-[(1Z)-2,6,6- trimethylcyclohex-2-enylidene)nona-1,3,5,7- tetraene (anhydro-vitamin A), H3C CH3 CH3 CH3 OH CH3
B,(3E,5E,7E)-3,7-dimethyl-9-[(1Z)-2,6,6- trimethylcyclohex-2-enylidene)nona-1,3,5,7- tetraene (anhydro-vitamin A)
C.(3E,5E,7E)-3,7-dimethyl-9-[(1Z-2,6,6- trimethylcyclohex-2-enylidene)nona-3,5,7- trien-1-ol (retro-vitamin A), D Oxidation products of vitamin A
C. (3E,5E,7E)-3,7-dimethyl-9-[(1Z)-2,6,6- trimethylcyclohex-2-enylidene)nona-3,5,7- trien-1-ol (retro-vitamin A), D. Oxidation products of vitamin A