Comparison of the 13C NMR spectra of (I) and frondoside A (II) showed (I) differed from (II) only by an additional terminal 25(26) double bond in the aglycon side chain, confirmed by 13C NMR signals (145.9 and 110.9 ppm) and 1H NMR signals (4.77 ppm for 2 H-26, 1.68 ppm for CH3-27). Catalytic hydrogenation of (I) (Adams catalyst, 20°C, 24 h) yielded dihydro derivative (II) completely coinciding with frondoside A in physicochemical characteristics and spectra, thus identifying cucumarioside A0-2 as 16α-acetoxy-3β-O-{O-(3-O-methyl-β-D-glucopyranosyl)-(1→3)-β-D-xylopyranosyl-(1→4)-[β-D-xylopyranosyl-(1→2)]-β-D-quinovopyranosyl-(1→2)-(4-O-sodiumsulfato)-β-D-xylopyranosyl}holosta-7,25-diene. Alkaloids from the epigeal part of Aconitum turczaninowii (gathered in the budding period near Mungun-Mor't sumon, Central aimak of Mongolia) were investigated: simple chloroform extraction yielded 1.5% total alkaloids (dry plant weight). Five bases were isolated by alumina column chromatography with gradient elution (hexane-chloroform, chloroform, chloroform-methanol); four were identified as aconitine, delsonine, delcosine, and lepenine via spectral analysis and comparison with authentic specimens. New alkaloid tursoline (C25H41NO8, mp 249-251°C (acetone)) was characterized: IR (3460 cm-1 for hydroxy groups, 1110 cm-1 for ether bonds); PMR (N-ethyl group, four methoxy groups, C-14-β proton); mass spectrum (M+ 483, characteristic ions). Acetylation with acetic anhydride/pyridine gave amorphous 1-acetyl derivative (II) (mass spectrum M+ 525, IR 1710 cm-1 for ester carbonyl, PMR confirming C-1 hydroxy group). Tursoline was determined as N-ethyl-1α,7β,8β,10β-tetrahydroxy-6β-14α,16β-trimethoxy-4β-methoxymethylaconitane (a C19 diterpene alkaloid), confirmed by 13C NMR comparison with delcarpoline (III) and delsonine (IV).