Figure 4From: The relationship of physico-chemical properties and structure to the differential antiplasmodial activity of the cinchona alkaloidsViews of Q-haematin and EQ-haematin models from the edge of the porphyrin ring to show comparative orientation (black arrows) of the electric field of the alkaloid N-1 proton (H-1). The haematin iron atom (just visible) is coloured magenta.Back to article page