. "SDN:P07::CF12N281" . . . "mass_concentration_of_isoprene_in_air"@en . "accepted"@en . . "2" . "" . "\"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 isoprene is CH2=C(CH3)CH=CH2. The IUPAC name for isoprene is 2-methylbuta-1,3-diene. Isoprene 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 . . "2019-05-14 17:27:19.0" . "2" . "false" . . "SDN:P07::CF12N281" . . . . "SDN:P07::CF12N281" . "2019-05-14 17:27:19.0" .