Nonadecane is an alkane hydrocarbon with the chemical formula CH<sub>3</sub>(CH<sub>2</sub>)<sub>17</sub>CH<sub>3</sub>, simplified to C<sub>19</sub>H<sub>40</sub>.
Nonadecane is found in Rosa ÃÂ damascena (8%-15%), Rosa ÃÂ alba (7%-13%) and n-Paraffin rich high altitude hybrids of both (20%-55%).