. "SDN:P07::CF12N417" . "mass_fraction_of_toluene_in_air"@en . "\"Mass fraction\" is used in the construction \"mass_fraction_of_X_in_Y\", where X is a material constituent of Y. It means the ratio of the mass of X to the mass of Y (including X). A chemical or biological species denoted by X may be described by a single term such as \"nitrogen\" or a phrase such as \"nox_expressed_as_nitrogen\". The chemical formula for toluene is C6H5CH3. Toluene has the same structure as benzene, except that one of the hydrogen atoms is replaced by a methyl group. The IUPAC name for toluene is methylbenzene."@en . "2019-03-04 17:29:46.0" . . . "" . "accepted"@en . "false" . . . . "SDN:P07::CF12N417" . . . "3" . . "2019-03-04 17:29:46.0" . "SDN:P07::CF12N417" . "3" . .