with increasing concentrations in the growth medium of the cyclization inhibitors nicotine or 2- ( 4-chlorophenylthio ) -triethylamine hydrochloride ( cpta ) the previously identified bicyclic carotenoids of rhizobium lupini ( 2,3,2',3'-tetrahydroxy-beta , beta-caroten-4-one and 2,3,2',3'-tetrahydroxy-beta , beta-carotene ) were successively replaced by hitherto unknown monocyclic carotenoids .
C0053396
beta-carotene
C0007271
carotenoids