Abstract
A new pyran derivative, 6-hydroxy-2H-pyran-3-carbaldehyde, has been isolated from the methanolic extract of Crinum yemense along with the known alkaloid haemanthamine, benzoic acid and 1,1'-bis(1,1'-carboxyethyl) ether which is isolated from a natural source for the first time. Structure elucidation of these compounds based on spectroscopic evidences. The pyran derivative was found to be a tyrosinase inhibitor more potent than kojic acid.