4-(10H-phenothiazin-10-yl)benzaldehyde InChI=1/C19H13NOS/c21-13-14-9-11-15(12-10-14)20-16-5-1-3-7-18(16)22-19-8-4-2-6-17(19)20/h1-13 benzaldehyde, 4-(10H-phenothiazin-10-yl)-