3758680 BTEX-H benzene, toluene, ethylbenzene, xylene, and n-hexane 11 3758682 BTEX-H benzene, ethylbenzene, toluene, xylene, and n-hexane 2 3758681 BTEX-H benzene, toluene, ethylbenzene, o-, m-, and p-xylenes and n-hexane 1