1,1',1''-methanetriyltribenzene 519-73-3 InChI=1/C19H16/c1-4-10-16(11-5-1)19(17-12-6-2-7-13-17)18-14-8-3-9-15-18/h1-15,19 benzene, 1,1',1''-methylidynetris-