Gas chromatograms of the C29 alkene region from an Arthrobacter chlorophenolicus A6 extract shown in comparison with synthetic standards. (A) Arthrobacter chlorophenolicus A6 extract. (B to D) Synthetic standards: cis-2,26-dimethyl-13-heptacosene (B), a mixture of cis-2,25-dimethyl-13-heptacosene and cis-3,26-dimethyl-13-heptacosene (C), and cis-3,25-dimethyl-13-heptacosene (D).