Fig. (4) Biological activity induced by an Amino-Steroid-Anthracenone derivative (ASA; 0.001-100 nM) on Left Ventricular Pressure (LVP) in absence or presence of tamoxifen. The experimental results showed that ASA significantly decreased LVP (p = 0.05) in a dose-dependent manner and this effect was not inhibited in presence of tamoxifen. Each data points represents the mean ± S.E. of 9 experiments.