<jats:p>Dimeric compounds 5,5’-oxydi(3-methyl-3-pyrrolin-2-one) and 5-hydroxy-3-methyl-1-(3’-methyl-2’-oxo-3’-pyrrolin-2-one were isolated from bulbs of <jats:italic>Lilium candidum</jats:italic> L., family <jats:italic>Liliaceae</jats:italic>. Structure of these compounds has been confirmed by spectral measurements. The ether link between two substituted pyrroline rings represents a new type of dimeric alkaloids.