Identification of sesquiterpene coumarins of oleo-gum resin of <i>Ferula assa-foetida</i> L. from the Yasuj region

<div><p>Chemical investigation of the oleo-gum resin of <i>Ferula assa-foetida</i> L. from Yasuj region led to the identification of five sesquiterpene coumarins namely, conferone (<b>1</b>), badrakemin (<b>2</b>), feslol (<b>3</b>), isosamarcandin (<b>4</b>) and samarcandin (<b>5</b>). The compounds were characterised by detailed 1D (¹H and ¹³C) and 2D NMR (HMBC, HSQC and NOESY) experiments. Among these compounds, conferone (<b>1</b>) and isosamarcandin (<b>4</b>) are being newly reported in <i>F. assa-foetida</i> L.</p>