From leaves of B. sempervirens a new steroidal alkaloid (+)-semperviramidine has been isolated and structurally elucidated as (20S)-16α-acetoxy-3β-benzoylamino-20-dimethylamino-4,4,14-trimethyl-9β,19-cyclo-5α-pregnane (1) by spectroscopic methods. In addition, the known alkaloid (+)-16α-acetoxybuxabenzamidienine (2) was isolated from this plant for the first time. © 1988.