The combined alkaloids from the roots of Physochlaina alaica E. Korot. were separated into benzene-, chloroform-, and water-soluble fractions. From the benzene fraction, apart from previously-known compounds, bases C₁₇H₁₉NO₃ (I) and C₁₇H₂₁NO₂ (II) were isolated; substance (II) was identified as apoatropine based on spectral data and mixed melting point test. The chloroform- and water-soluble fractions yielded new bases C₁₇H₂₃NO₄ (III) and physochlaine (IV). Physochlaine (C₁₇H₂₃NO₄) was characterized by IR, UV, mass, and NMR spectra, and its structure was determined to be 3α-(p-methoxyphenylacetoxy)tropan-6β-ol based on spectral analysis and hydrolysis to tropane-3α,6β-diol.