New alkadiene, benzyl linolenate and lawsone arabinosyl ester from the fruits of Amomum subulatum Roxb

Amomum subulatum Roxb (Zingiberaceae) is a perennial herb which is cultivated in Sikkim and neighbouring areas. Its fruits are used to treat abdominal disorders, vomiting, problems of throat, liver and lungs and rectal disease. Phytochemical investigation of the methanolic extracts of the fruits led to the isolation of three new chemical constituents characterized as n-hexatriacont-16,18-diene, 3-methoxybenzyl octadec-9′,12′,15′-trienoate, and 1,4-naphthoquinone-2-olyl-β-d-arabinopyranosyl-2′-(2″,6″,10″,14″-tetramethylhexadecane)-1″-oate along with a glyceride identified as glyceryl-1-linoleate-2,3-dioleate. The structure of all these phytoconstituents has been established on the basis of spectral data analysis.