Coumarins, which are chemical derivatives of benzo-2-pyrones or chromen-2-ones, are widely distributed in various species of plants. [ 1 1. (a) Murray , RDH Nat. Prod. Rep. 1995 , 12 , 477 – 506 and references cited therein; (b) Oyamada , J. ; Kitamura , T. Tetrahedron 2006 , 62 , 6918 – 6925 . [CrossRef], [Web of Science ®] View all references ] Coumarins have been reported to exhibit antibacterial, anticarcinogenic, and analgesic activity. [ 2 2. (a) Basile , A. ; ...