alkyl: any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons
group: (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
salafism: a militant group of extremist Sunnis who believe themselves the only correct interpreters of the Koran and consider moderate Muslims to be infidels; seek to convert all Muslims and to insure that its own fundamentalist version of Islam will dominate the world