. "" . . . . "mass_concentration_of_limonene_in_air"@en . . "2019-05-14 17:27:19.0" . . . "2" . . "2" . "SDN:P07::CF12N282" . "SDN:P07::CF12N282" . "2019-05-14 17:27:19.0" . "SDN:P07::CF12N282" . "accepted"@en . "\"Mass concentration\" means mass per unit volume and is used in the construction mass_concentration_of_X_in_Y, where X is a material constituent of Y. 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 limonene is C10H16. The IUPAC name for limonene is 1-methyl-4-prop-1-en-2-ylcyclohexene. Limonene is a member of the group of hydrocarbons known as terpenes. There are standard names for the terpene group as well as for some of the individual species."@en . . "false" .