Mahmud, Sarbast A A New Ursane-type Triterpenoid and Other Constituents from the Leaves of Crataegus azarolus var. aronia. [electronic resource] - Natural product communications Nov 2016 - 1637-1639 p. digital Publication Type: Journal Article ISSN: 1934-578X Subjects--Topical Terms: Crataegus--chemistryMolecular StructurePlant ExtractsPlant Leaves--chemistryTriterpenes--chemistry