title: Isolation of two benzocoumarins from 'clover stone' a type of renal calculus found in sheep.
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D002854:Chromatography, Paper; D003374:Coumarins; D007259:Infrared Rays; D007669:Kidney Calculi; D011083:Polycyclic Compounds; D012756:Sheep; D012757:Sheep Diseases; D013057:Spectrum Analysis
chemical_list: D003374:Coumarins; D011083:Polycyclic Compounds