116740-51-3 L 156903 L-156,903 L-Phenylalanine, N-(1-(N2-(1-oxo-3-(10H-phenothiazin-10-yl)propyl)-L-arginyl)-L-prolyl)- N-(1-(N(2)-(1-Oxo-3-(1-H-phenothiazin-10-yl)propyl)arginyl)-prolyl)-phenylalanine