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Three new natural coumarin substances 1, 2 and 3 (derivatives of 2',2'-dimethyl-3',4'-dihydroxydihydropyrano-5',6':6,7-coumarin) were isolated from the roots and fruits of Peucedanum arenarium W.K.On the basis of the spectral data from UV, IR, and NMR spectra of coumarin 1, named peuarenarine, it was assumed, that, it is an ester of 2',2'-dimethyl-3',4'-dihydroxy-dihydropyrano-5',6' :6,7-coumarin and of angelic and 2,3-epoxy-2-methylbutyric acids. The UV spectrum (Table 1) In its IR spectrum appear absorption bands, specific of coumarins: 1638, 1580 cm"" 1 (aromatic ring), 1735 -1754 cm -1 (C = 0 of a-pyron cycle). As was announcedThis wide carbonyl band suggests also the presence of ester groups.According to the physicochemical constants coumarin 1, isolated by us, is a new acylcoumarin, for which we propose the name peuarenarine.

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