I have found sites which claim that "it" (cymbopogon pendulus) has been widely used commercially but all I can find are
the ones from the western (c.citratus) and eastern (c.flexuosus) regions.
If one really wanted to find North indian lemongrass oil It's possible that emailing one of the lemongrass dealers from
this link might help.
[URL unfurl="true"]http://dir.indiamart.com/impcat/lemongrass-oil.html[/URL]
Elemi oil (Canarium luzonicum) seems to be readily availible though.
"Elemicin (4-allyl-l,2,6-trimethoxy benzene), C12H1603, constitutes the principal constituent of Manila elemi oil, in which it was discovered by Semmler1) who also gave it its name. It is found in fraction 277 to 280° of elemi oil.2) In order to isolate elemicin, the fraction in question is boiled for half an hour with formic acid...."
[URL unfurl="true"]http://chestofbooks.com/health/aromatherapy/The-Volatile-Oils-Vol1/Elemicin.html[/URL]
Elemicin boiling point, flash point etc...
[URL unfurl="true"]http://www.thegoodscentscompany.com/data/rw1021681.html[/URL]