Continuing the separation of the combined alkaloids of the epigeal part of Delphinium dictyocarpum DC. collected in the flowering phase in the environs of the village of Topolevsky (Dzhungarian Ala-tau) [1-3], a new base (I) with the molecular formula C33H46O9N2 (melting point 118-120°C in methanol, molecular ion peak M+ 614) was isolated. The IR spectrum of (I) shows absorption bands at 3460 cm⁻¹ (hydroxy groups), 1690 and 1740 cm⁻¹ (carbonyl groups), 1593 cm⁻¹ (aromatic ring), and 1090 cm⁻¹ (ether C-O bonds). Its NMR spectrum contains signals corresponding to an N-ethyl group (a three-proton triplet at 1.04 ppm), an acetyl group (a three-proton singlet at 2.02 ppm), three methoxy groups (three-proton singlets at 3.18, 3.26, and 3.29 ppm), four aromatic protons (multiplets at 6.61 and 7.76 ppm), and a one-proton triplet at 4.73 ppm (J≈5 Hz) characteristic of a β-proton at C10 geminal to an acetoxy group. Mass spectral data (with the maximum peak being the ion M-31) indicates a α-methoxy group at C1. Identity of the aromatic proton signals in the NMR spectrum of (I) with those of delectine (II) and the presence of an intense ion peak at m/e 120 (due to an anthranilic acid residue) in the mass spectrum of (I) suggest the amino alcohol in (I) is acylated with anthranilic and acetic acids. Acetylation of (I) with acetic anhydride in pyridine yielded a monoacetate (III) (C35H48O10N2, melting point 128-130°C in hexane-ether) identical to the N,O-diacetate of delectine. Based on spectral characteristics, chemical reactions, and comparisons, the new base (I) is identified as 10-O-acetyldelectine, a diterpene alkaloid with a lycoctonine skeleton.