Three substances are separated from the above-ground part of Artemisia maritima L. by column chromatography method in an individual state: C15H18O3 with a m.p. of 171-172°C (substance 1), C15H18O3 with a melting temperature of 130-131°C (substance 2), C15H18O4 with a melting point of 201- 202°С (substance 3), which are identified as α-santonin, glabellin and artemisin on the basis of 1H NMR spectra and direct comparison of IR spectra.